LEARNING HUB.TZ

CHEMISTRY EXAMINATION FORM ONE

TOPICAL EXAMINATIONS.

INTRODUCTION TO CHEMISTRY.

NAME………………………………………..CLASS…………………………………………….……………TIME: 2¹/₂HRS

INSTRUCTIONS:-

1. This paper consists of sections A, and B

2. Answer all questions

3. All answers must be written in the spaces provided

4. All writings should be in blue/black inks except for drawings that should be in pencils

SECTION A 20 MARKS

1. MULTIPLE CHOICE QUESTIONS

1. The term chemistry means;

1. Study of nonliving things

2. Study of physical properties of matter

3. Study of drugs

4. Study of composition and decomposition of matter

2. Substances studied in chemistry are made up of;

1. Compounds

2. Matter

3. Chemicals

4. Element

3. Which is not an importance of studying chemistry;

1. Understand how matter undergo chemical change

2. Make various medical products

3. Understand the use of chemicals in agriculture

4. Help us enter into various careers.

4. A mother at home can apply chemistry to;

1. Weed flowers in the garden

2. Dusting the floor of her house

3. Weighing maize flour

4. Cooking food in the kitchen

5. Which of the following illustrates a chemical reaction taking place in our body

1. Falling sick

2. Digestion

3. Respiration

4. Salivating

6. Which of the following is not a list of application of chemistry?

1. Table, chairs and Bricks

2. Shoe polish, antiseptics and toothpaste

3. Soap, medicinal drugs and perfumes

4. Fertilizer, pesticides and herbicides

7. Which of the following careers does not require the knowledge of chemistry?

1. Medicine

2. Agriculture

3. Archeology

4. Pharmacy

8. Identify the skill not acquired during chemistry study

1. Careful observation

2. Accurate reporting

3. Testing hypothesis experimentally

4. Map reading skills

9. Individuals who studied chemistry long time ago were called

1. Alchemists

2. AL chemistry

3. Witch doctors

4. Chemists

10. Chemistry is list related to;

1. Biology

2. History

3. Physics

4. Geography

2. MATCHING ITEMS QUESTIONS.

3. Write T for true statement and F for a False statement.

1. There are only two branches of science

2. Chemistry has little application in our life

3. Through chemistry, development of modern technology is made possible

4. We only study chemistry to enter into careers

5. Chemistry is only studied by chemists

b) Fill in the spaces below;

i) The field of science that deals with crop production and livestock management is called……………

ii) Ink, shoe polish, paper, clothes and rubber are examples of things produced from application of knowledge of…………………………………………………….

iii) Study of chemistry prepares people for different skills needed in our daily life such as………….

iv) Chemicals used to kill insects are called………………………………………………………..

v) The study of matter and its properties is called…………………………………

4. A) mention three branches of science

b) Who is a chemist?

c) List 5 places where chemistry is applied

d) Name three cleaning agents made by chemistry knowledge

5. Explain how chemistry is applied in the following;

1. Health

2. Agriculture

3. Energy production

4. Transport

5. Modern technology

6. Mention four importance of studying chemistry

7. Mention two items used in each of the following categories that are made through application of chemistry

1. Agriculture

2. Pharmaceutical

3. Household items

4. Food and beverages

5. Transport

b) Chemistry has contributed to environmental hazards. Briefly explain how

8. a) Who are alchemists?

b) What was the aim of alchemists?

c) Briefly explain how chemistry has contributed to good life

9. a) Mention areas where chemistry is applied.

b) Mention five careers one can enter by studying chemistry.

10. a) mention two branches of chemistry

b) Differentiate chemistry from physics.

CHEMISTRY FORM ONE – TOPICAL EXAMINATION

CHAPTER 01: INTRODUCTION TO CHEMISTRY

Time: 2 Hours

INSTRUCTIONS

1. Answer all questions.
2. Write your answers clearly and neatly.
3. For multiple-choice questions, choose the correct answer.
4. Read each question carefully before answering.

SECTION A: (15 MARKS)

1. Choose the correct answer. (10 marks)

(i) Chemistry is a branch of science that deals with:

1. the movement of planets only
2. the composition, structure and properties of matter and changes that matter undergoes
3. the classification of living organisms only
4. the study of maps only

(ii) A person who studies chemistry is called a:

1. chemist
2. geologist
3. physicist
4. biologist

(iii) Which area of chemistry deals with methods used to separate, identify and quantify chemical species in matter?

1. Organic chemistry
2. Analytical chemistry
3. Biochemistry
4. Inorganic chemistry

(iv) Which branch of chemistry studies chemical processes that occur in living things?

1. Physical chemistry
2. Biochemistry
3. Geochemistry
4. Chemical engineering

(v) The relationship between chemistry and agriculture is mainly represented by:

1. agro-chemistry
2. geochemistry
3. biochemistry
4. physical chemistry

(vi) Which field applies chemistry theories and principles to study chemical interactions in the environment, including pollution?

1. Environmental chemistry
2. Organic chemistry
3. Inorganic chemistry
4. Biochemistry

(vii) Which of the following is a chemical product used in agriculture?

1. Fertiliser
2. Sand
3. Stone
4. Timber

(viii) Which of the following is a food preservative mentioned in the topic?

1. Sodium benzoate
2. Iron filings
3. Copper wire
4. Silicon

(ix) Which of the following is a home-care product produced through chemical processes?

1. Soap
2. Granite
3. Timber
4. Gravel

(x) Which scientific skill involves carrying out an experiment again to ensure that observations are accurate?

1. Predicting outcomes
2. Repeating tests
3. Drawing conclusions
4. Recording information

2. Match the items in List A with the correct responses in List B. (5 marks)

SECTION B: (70 MARKS)

3. (a) Define chemistry. (2 marks)

(b) Explain four areas of chemistry and state what each area deals with. (8 marks)

4. (a) State four scientific skills that chemists should acquire when conducting experiments. (4 marks)

(b) Explain how any three of the skills in (a) help a chemistry student to obtain reliable information. (6 marks)

5. (a) Explain four relationships between chemistry and the following disciplines: biology, physics, agriculture and geology. (8 marks)

(b) State two professions that may result from studying chemistry together with other related disciplines. (2 marks)

6. (a) What is environmental chemistry? (2 marks)

(b) Explain four ways in which chemistry contributes to the understanding of environmental science. (8 marks)

7. (a) State four applications of chemistry in agriculture. (4 marks)

(b) Explain three benefits of chemical products used in agriculture. (6 marks)

8. (a) Give four examples of chemical substances or products used in food and beverage industries. (4 marks)

(b) Explain three ways in which chemistry contributes to nutrition and cooking. (6 marks)

9. A community uses medicines, fuels, soaps, plastics, batteries and processed foods in daily life.

1. Explain four ways chemistry contributes to the manufacture or use of these products. (8 marks)
2. State two ways chemistry contributes to communication and technology. (2 marks)

SECTION C: (15 MARKS)

10. A growing community wants to improve agriculture, health, transport, food production, communication and environmental sustainability.

1. Explain briefly why chemistry is important in the development of a modern society. (3 marks)
2. Explain six ways in which chemistry can contribute to the development of the community described above. (9 marks)
3. State three general benefits of applying chemistry knowledge, skills and processes in modern society. (3 marks)

GRAND TOTAL: 100 MARKS

CHEMISTRY – FORM ONE

TOPICAL EXAMINATION

TOPIC 01: INTRODUCTION TO CHEMISTRY

TIME: 2:30 HOURS

INSTRUCTIONS

1. This examination consists of Sections A, B and C with a total of ten (10) questions.

2. Answer all questions in all sections.

3. Section A carries fifteen (15) marks, Section B carries seventy (70) marks and Section C carries fifteen (15) marks.

4. Write your answers clearly and use appropriate chemical terms where necessary.

5. Read each question carefully before answering it.

SECTION A (15 MARKS)

Answer all questions in this section.

1. Choose the correct answer from the alternatives given. (10 marks)

i. Chemistry is a branch of science that deals with:

1. Composition, structure, properties and changes of matter
2. Movement of living organisms only
3. Distribution of rocks on the Earth's surface only
4. Study of numbers and shapes

ii. Which statement correctly describes matter?

1. Anything that can change colour
2. Anything that has mass and occupies space
3. Anything that can dissolve in water
4. Anything that can be seen by the naked eye

iii. A person who studies chemistry is called a:

1. Physicist
2. Biologist
3. Chemist
4. Geologist

iv. Which branch of chemistry deals with chemical processes occurring in living things?

1. Biochemistry
2. Analytical chemistry
3. Inorganic chemistry
4. Physical chemistry

v. Which branch of chemistry deals with instruments and methods used to separate, identify and quantify chemical species?

1. Organic chemistry
2. Analytical chemistry
3. Biochemistry
4. Chemical engineering

vi. Which of the following is a scientific skill required by a chemistry student?

1. Making thorough observations
2. Ignoring experimental results
3. Avoiding repeated tests
4. Changing observations to fit predictions

vii. The field that connects chemistry with agriculture is known as:

1. Geochemistry
2. Agro-chemistry
3. Biotechnology
4. Physical chemistry

viii. Which chemical product is commonly used to improve the quality and quantity of crops?

1. Fertiliser
2. Lubricant
3. Deodorant
4. Coolant

ix. Which of the following is an application of chemistry in transport?

1. Production of fuels and lubricants
2. Production of crop seeds
3. Teaching languages
4. Preparation of school timetables

x. Which group consists entirely of home care products?

1. Soap, detergent, air freshener and polish
2. Fertiliser, vaccine, pesticide and feed
3. Fuel, tyre, battery and coolant
4. Lipstick, lotion, vaccine and fertiliser

2. Match the descriptions in List A with the correct terms in List B. (5 marks)

SECTION B (70 MARKS)

Answer all questions in this section.

3.

1. Define chemistry. (2 marks)

2. Define matter. (2 marks)

3. Explain three (3) scientific skills that a chemistry student should acquire when carrying out scientific investigations. (6 marks)

4.

1. Distinguish between organic chemistry and inorganic chemistry. (4 marks)

2. Explain the meaning of analytical chemistry. (2 marks)

3. Explain two (2) functions of mathematics in the study of chemistry. (4 marks)

5.

Chemistry is not an isolated discipline. It is closely related to several other fields of study.

1. Explain how chemistry is related to biology. (2 marks)

2. Explain how chemistry is related to physics. (2 marks)

3. Explain how chemistry is related to agriculture. (2 marks)

4. Explain how chemistry is related to environmental science. (2 marks)

5. State one (1) career that can result from studying chemistry together with other related disciplines. (2 marks)

6.

A farmer wants to increase crop production and protect both crops and animals from harmful organisms.

1. Name two (2) products made through chemical processes that can be used to improve crop production and protection. (2 marks)

2. Explain the role of fertilisers in agriculture. (2 marks)

3. Explain the role of pesticides in agriculture. (2 marks)

4. Explain two (2) importance of animal vaccines in agriculture. (4 marks)

7.

Chemistry contributes greatly to medicine, nutrition and cooking.

1. Explain two (2) applications of chemistry in medicine. (4 marks)

2. Name four (4) food components that can be identified through the knowledge of chemistry. (4 marks)

3. Explain one (1) importance of chemical processes during cooking. (2 marks)

8.

A food-processing company wants to preserve some of its products so that they can remain suitable for use for a longer period.

1. Name four (4) chemical substances that can be used as food preservatives. (4 marks)

2. Explain why chemically preserved foods can last longer than unpreserved foods. (2 marks)

3. Explain two (2) ways in which chemistry contributes to manufacturing industries. (4 marks)

9.

A community has benefited from motor vehicles, mobile phones, detergents and cosmetics. All these products involve applications of chemistry.

1. Explain two (2) applications of chemistry in transport. (4 marks)

2. Explain two (2) applications of chemistry in communication and technology. (4 marks)

3. State one (1) example of a home care product and one (1) example of a cosmetic product made through chemical processes. (2 marks)

SECTION C (15 MARKS)

Answer Question 10.

10. Read the following scenario carefully and answer the questions that follow.

The people of Upendo Village depend mainly on agriculture. For several years, farmers obtained low crop yields because their soils lacked sufficient nutrients and crops were frequently attacked by pests. The village also experienced problems of unsafe water and poor sanitation. After receiving scientific advice, farmers started using fertilisers and pesticides appropriately. The community began treating water and using soaps and detergents to improve hygiene. A nearby health facility also provided medicines and vaccines for preventing and treating diseases. As a result, the health and living conditions of the community improved.

1. Identify three (3) applications of chemistry mentioned in the scenario. (3 marks)

2. Explain three (3) ways in which chemistry has helped to improve the lives of people in Upendo Village. (6 marks)

3. Explain two (2) scientific skills that members of the community could apply to determine whether the introduced practices are producing the expected results. (4 marks)

4. What conclusion can you draw about the importance of chemistry in modern society? (2 marks)

END OF EXAMINATION

LEARNING HUB.TZ

CHEMISTRY EXAMINATION FORM ONE

TOPICAL EXAMINATIONS.

CHEMISTRY LABORATORY

NAME………………………………………..CLASS…………………………………………….……………TIME: 2¹/₂HRS

INSTRUCTIONS:-

1. This paper consists of sections A, and B

2. Answer all questions

3. All answers must be written in the spaces provided

4. All writings should be in blue/black inks except for drawings that should be in pencils

SECTION A:

1. Choose the best answer from the given statements, and write it in the table provided below;

1. Which of the following warning signs is likely to appear on a bottle containing concentrated nitric acid in the laboratory?

1. Corrosive

2. Explosive

3. Irritant

4. Flammable

2. When a chemist studies a substance h/she is interested in its;

1. Force of attraction

2. Properties

3. Shape

4. Smell

3. Certain activities are required in order to manage laboratory techniques and safety. There are;

1. Laboratory rules to be observed

2. First Aid to be used

3. Warning signs and protective symbols to be used

4. All of the above

4. What can be the cause of fires in the laboratory;

1. Exposure of flammables to heat and open fires

2. Improper treatment of explosive and highly reacting substances

3. Performing experiments without permission and without protection

4. All of the above

5. What might happen to a careless pupil in the laboratory?

1. He may get injuries

2. He will not achieve in studies

3. He will cause loss of things

4. Nothing will happen

6. A person who loses too much blood due to an accident is likely to go into;

1. Burns

2. Shock

3. Sores in his/her mouth

4. Painful wounds

7. Which one of the following statement does not show that chemistry knowledge has been applied?

1. Rock and earthly materials are changed to iron and steel

2. We obtain processed food stuffs and drinks from industries

3. Pharmaceutical works provide with various types of medicine

4. We can enjoy music produced by the best singer

8. A booklet containing guidelines for first Aid is a;

1. Chemistry book

2. First kit

3. First Aid manual

4. First Aid component

9. A form one student found a bottle with a sign of a skull and crossed bones. The sign means;

1. Toxic

2. Irritant

3. Flammable

4. Explosive

10. Which of the following is not among the instruments and chemicals used for First Aid?

1. Pair of scissors

2. Mosquito net spray

3. Assorted bandages

4. Sterilized cotton wool

i	ii	iii	iv	v	vi	vii	viii	ix	x

2. Match the items of column B to those of column A for meaningful statements and enter the answers in the table provided below;

COLUMN A:

1. Gas poisoning

2. A laboratory rule

3. Usually applied on fresh wounds and bruises

4. Used to protect the clothes of a caregiver against dirt and fluids such as blood, pus from the patient or victim.

5. Explosion

6. A measure taken to protect people or things against possible harm or trouble

7. Fertilizers, drugs, detergents

8. Can poison you and can cause immediate death

9. Apparatus

10. Symbol for magnesium element

COLUMN B:

1. Apron

2. No fume chamber

3. Oral ingestion

4. Chemistry application

5. Things which are used to carry out experiments in the laboratory

6. Iodine tincture

7. Pain killers

8. Precautions

9. Toxic

10. Mg

11. Corrosive

12. Be calm and silent

13. A forceful rapid reaction which involved throwing off particles at high speed and releasing energy such as heart and loud sounds.

14. Mn

15. History

16. Harmful

SECTION B:

Answer these questions only shortly and briefly.

2. (a) Write TRUE for a correct statement and FALSE for a false statement, in the

Following;

1. The hazard label for petrol is normally flammable sign which means catches fire easily ……………..

2. Fuels and chemicals such as plastics, pesticides, perfumes, detergents are the products made from soil and natural gas. ……………….

3. A form one student found a bottle with a sign of a skull and crossed bones. The sign means explosion. ………………

4. Never keep toxic materials in children’s’ reach areas since they may poison them ……………..

5. Experiments in which poisonous gases and vapour are produced, must not be carried out in a fume chamber. ……………………

6. A school laboratory should always be clean and well arranged ………………

2. What is the purpose of doing experiments in the learning of chemistry? ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

3. (a) What is the aim of using warning sign on containers in the chemistry laboratory? ………………………………………………………………………………………………………………………………………………………………………………………………

(b) Name one example of a protective symbol ………………………………………………………………………………………………

2. In the space below, draw clear and neat warning signs found on containers

1. Corrosive (iii) Explosive

2. High flammable/ inflammable

2. Write name of one chemicals under each of the following

1. Oxidant/oxidizing agent ……………………………………………………………

2. Toxic/poison …………………………………………………………………………

3. Harmful/ irritant ……………………………………………………………………...

2. Draw the following warning signs

1. oxidant (b) flammable

2. State three areas where chemistry knowledge is applied in day to day life; and give TWO examples in each area.

Area	Example
i.
ii.
iii.

2. Complete the following table;

FIRST AID KIT

A pair of scissors	Diagrams	Quantity	Used for	How used
		1		Measuring body temperature.
Sterilized cotton wool		1 reel	Washing

2. Name six injuries which can be caused by running in the laboratories or in the corridor of it.

1. ……………………………………………………………….

2. ………………………………………………………………..

3. ………………………………………………………………..

4. ………………………………………………………………..

5. ……………………………………………………………….

6. ………………………………………………………………..

SECTION C:

Include only the necessary points in answering the following questions.

2. How can you help a fellow student who has been injured by a chemical splash into his/her eyes?

2. As a safety measure it is stated that “wear protective equipments when doing dangerous experiments”. How you can explain this

CHEMISTRY FORM ONE TOPICAL EXAMINATION

CHAPTER 02: LABORATORY TECHNIQUES AND SAFETY

Time: 2 Hours

Instructions

1. This paper consists of Sections A, B and C with a total of ten (10) questions.

2. Answer all questions.

SECTION A (15 Marks)

1. Choose the correct answer in items (i)–(x). (10 marks)

(i) Which laboratory safety facility should be fitted in an accessible position for use during a fire accident?

1. First Aid guide
2. Fire extinguisher
3. Measuring cylinder
4. Fume chamber

(ii) Which practice is correct when an experiment produces harmful gases and vapours?

1. Work near a closed window
2. Smell the gas carefully
3. Use a fume chamber
4. Cover the gas with a cloth

(iii) Which First Aid Kit item is mainly used to cover wounds and protect them from dirt and germs?

1. Sterile gauze
2. Clinical thermometer
3. Whistle
4. Safety pin

(iv) A student suddenly loses consciousness because insufficient blood and oxygen reach the brain. Which condition has occurred?

1. Choking
2. Bruising
3. Fainting
4. Burning

(v) Which apparatus accurately measures and dispenses a known volume of liquid and is commonly used in titration?

1. Beaker
2. Burette
3. Test tube
4. Watch glass

(vi) Why should chemical containers be well labelled?

1. To make chemicals attractive
2. To prevent accidental use of wrong substances
3. To increase the amount of chemicals
4. To make containers heavier

(vii) Which apparatus is used to measure a specific volume of liquid for transfer to another container?

1. Pipette
2. Tripod stand
3. Spatula
4. Crucible

(viii) What should be done first before assisting a person who is still in contact with electric current?

1. Give the victim water
2. Touch and pull the victim away
3. Switch off the power source
4. Cover the victim with a blanket

(ix) Which statement correctly describes a beaker?

1. It measures liquid volume with the highest accuracy
2. It can only be made of metal
3. It can estimate liquid volume and may be used for mixing
4. It is used only for measuring temperature

(x) Which laboratory rule should be followed after practical activities?

1. Return unused chemicals to their original containers
2. Leave gas and water taps open
3. Pour concentrated chemicals into the sink
4. Clean the equipment and store it safely

2. Match the items in List A with the correct responses in List B. (5 marks)

SECTION B (70 Marks)

3. (a) Define the term First Aid. (2 marks)

(b) Explain four importance of First Aid to a sick or injured person. (8 marks)

4. Your school is constructing a new chemistry laboratory. Explain five safety features that should be considered when preparing the laboratory for safe use. (10 marks)

5. (a) What is a laboratory rule? (2 marks)

(b) Explain four reasons for following laboratory rules during practical activities. (8 marks)

6. A student finds a classmate lying on the laboratory floor after suddenly fainting. Describe five steps the student should take to provide appropriate First Aid. (10 marks)

7. Explain five possible causes of accidents in a chemistry laboratory. (10 marks)

8. A student is preparing for a chemistry practical involving measurement of liquids and mass.

(a) State the use of each of the following apparatus: (5 marks)

1. Pipette
2. Measuring cylinder
3. Burette
4. Beaker
5. Triple beam balance

(b) Explain why a beaker is less suitable than a pipette or burette when an accurate volume is required. (5 marks)

9. Give a reason for each of the following laboratory practices: (10 marks)

1. Chemical containers should be properly labelled and closed after use.
2. Inflammable substances should be kept away from open flames.
3. Laboratory users should not touch electrical equipment with wet hands.
4. Concentrated chemicals should not be poured into sinks.
5. Cracked or broken apparatus should not be used.

SECTION C (15 Marks)

10. During a chemistry practical, a student accidentally knocks over a chemical container. Another student slips on the spill and suffers a bleeding wound, while harmful vapours spread around the working area. Using your knowledge of laboratory techniques and safety, explain how you would respond to the situation. In your answer, consider protection of laboratory users, management of the chemical spill, First Aid to the injured student and prevention of a similar accident in the future. (15 marks)

LEARNING HUB.TZ

CHEMISTRY EXAMINATION FORM ONE

TOPICAL EXAMINATIONS.

FIRST AID

NAME………………………………………..CLASS…………………………………………….……………TIME: 2¹/₂HRS

INSTRUCTIONS:-

1. This paper consists of sections A, and B

2. Answer all questions

3. All answers must be written in the spaces provided

4. All writings should be in blue/black inks except for drawings that should be in pencils

SECTION A: 20 MARKS

1.Choose and write the letter of the best answer in each of the multiples choices in the space provided;

1. Which one is the correct meaning of first aid kit;

1. An immediate help given to an accident victim before attending the hospital.

2. A small box consists of metal tools only.

3. A bag consists of books and chemicals.

4. A small box consists of different instruments and chemicals in assisting an accident victim.

5. What is chemistry?

A. The branch of science which deals with the study of life

1. The branch of science which deals with the study of energy, force, mechanics, waves and the structure of atoms and the physical universe.

2. The branch of science which deals with the study of properties, composition and structure of matter and the changes matter undergo.

3. The help that one is given before attending to the hospital.

6. What do you call an instrument which is used in holding chemicals and heating chemicals;

1. Measuring cylinder

2. Gas jar

3. Test tube

4. Funnel

7. When one wants to light the Bunsen burner, what is the first thing to do;

1. Light a match/wooden splint and hold it at the gas tap using the rubber tubing.

2. Close air hole and connect the burner to the gas tap using the rubber tubing.

3. Open the gas tap slowly to half way to fully open position.

4. Open the hole slowly

8. What is the best definition of Brownian motion?

1. Uniform movement of particles

2. A motion discovered by Robert Brownian

3. A random movement of particles of gas and liquid

4. A random movement of particles of gas and solid

9. Which of the following is the Latin name of mercury;

1. Hydragyrum B. Hydrogyrum C. Hydragum D. Hydrorum

10. The English name of Argentium is;

1. Gold B. Lead C. Sodium D. Silver

11. A metal that is usually in liquid form is called;

1. Mercury B. Bromine C. Iron D. Sulphur

12. A symbol which represents the substances which can catch fire easily is;

1. Flammable B. Toxic C. Explosive D. Radioactive

13. Factors in an experiment that can be manipulated to get desired results are called;

1. Controlled variables

2. Uncontrolled variables

3. Dependent variables

4. Independent variables

i	ii	iii	iv	v	vi	vii	viii	ix	x

1. Write the letter of the best match from column B against a name of the element in column A.

COLUMN A	COLUMN B
Sodium Potassium Mercury Silver Gold Chlorine Helium Neon Copper lead	Pb L Na Au Cu Cl Hg N Me Ag Co Ne He K P S

i	ii	iii	iv	v	vi	vii	viii	ix	x

SECTION B: 54 MARKS

1. (a) Why is the chemical symbol of sodium “Na” instead of “S”? ……………………………………………………………………………………………………….

(b) Mention the three rules of assigning symbols to elements

i. ………………………………………………………………………………………………

ii. ……………………………………………………………………………………………….

iii. ………………………………………………………………………………………………

2. (a) Give the reason to why the chemicals in the laboratory should be labeled and well closed after use. ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………..

(b) The shelves in the laboratory should be labeled and constructed in a way that it is at the eye level and not above the eye level. Give the reason behind the statement ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

3. (a) Write the 6 scientific procedure in a form of descending (from the last to the first) ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

(b) There is no solution of a problem without research. Prove the statement. ………………………………………………………………………………………………………………………………………………………………………………………………………………

4. Fill in the blanks in the below names of the elements;

1. H_dr_g_r_m

2. N_ t_ _um

3. _l_ m _um

4. _r_ en_ium

5. Pot_ _ _ium.

6. B_ r _ _ _ium

5. (a) What are the effect if on to fails to follow the following laboratory instructions;

1. Failure to follow instructions guided. …………………………………………………………………………………………..

2. Improper disposal of broken glass materials ……………………………………………………………………………………………….

(b) Write the functions of the following laboratory tools 2 functions;

Round bottomed flask

i. …………………………………………………………………………………………..

ii. …………………………………………………………………………………………..

Burette

i. ……………………………………………………………………………………….

ii. ……………………………………………………………………………………….

6. (a) Draw the diagrams of the following warning signs;

1. Toxic (ii) Flammable (iii) Radioactive

(b) Give the reason to why most of petrol stations and cars have areas written “NO SMOKING”?

……………………...................................................................................................................................................................................................................................................................................................................

7. (a) Draw a well labelled diagram of a luminous flame;

(b) Mention the regions of non – luminous flame.

8. (a) What is a compound? Give three examples of a compound. ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….

2. What is a mixture? Give five examples of mixture …………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….

9. Write down six properties of a metal;

9. …………………………………………………………………………………………………

ii. ………………………………………………………………………………………………..

3. ………………………………………………………………………………………………..

4. ………………………………………………………………………………………………..

5. ………………………………………………………………………………………………..

6. …………………………………………………………………………………………………

10. Give explanation on how many ways can metal and non metal be differentiated with proper examples and diagram where necessary.

CHEMISTRY FORM ONE TOPICAL EXAMINATION

CHAPTER 03: FIRE, FIREFIGHTING AND FLAMES

Time: 2 Hours

Instructions

1. This paper consists of Sections A, B and C with a total of ten (10) questions.
2. Answer all questions.
3. Write your answers clearly and use appropriate chemical terms where necessary.

SECTION A (15 Marks)

Answer all questions in this section.

1. Choose the correct answer in items (i)–(x). (10 marks)

(i) Which combination represents the three components of the fire triangle?

1. Fuel, oxygen and heat
2. Fuel, water and heat
3. Oxygen, water and sand
4. Heat, carbon dioxide and water

(ii) Which statement correctly defines firefighting?

1. The process of producing flames for heating
2. The act of extinguishing fires and mitigating their effects
3. The process of supplying oxygen to burning materials
4. The act of increasing the temperature of a fuel

(iii) A small fire involving kerosene should be extinguished using:

1. water only.
2. sand or a fire blanket.
3. an air pressurised water extinguisher.
4. more kerosene.

(iv) Why should water not be used to extinguish a fire involving flammable liquids?

1. Water increases the supply of oxygen
2. Water changes the liquid into a solid
3. The flammable liquid may float on water and spread the flame
4. Water produces a luminous flame

(v) Which type of flame is yellow, produces soot and gives less heat?

1. Non-luminous flame
2. Luminous flame
3. Blue flame
4. Invisible flame

(vi) Which condition produces a non-luminous flame in a Bunsen burner?

1. Air holes fully open
2. Air holes completely closed
3. Gas supply completely closed
4. No oxygen entering the burner

(vii) Which part of a Bunsen burner is turned to regulate the amount of air entering through the air holes?

1. Base
2. Jet
3. Collar
4. Gas inlet

(viii) Which flame is most suitable for heating substances in the laboratory?

1. Luminous flame because it produces soot
2. Non-luminous flame because it produces more heat
3. Luminous flame because it is yellow
4. Luminous flame because it has limited oxygen

(ix) Before extinguishing a fire caused by an electrical fault, the first important action is to:

1. pour water on the equipment.
2. turn off the main electrical switch.
3. touch the burning equipment.
4. open the gas supply.

(x) What should be done when a fire gets out of control?

1. Continue fighting it without assistance
2. Hide the fire extinguisher
3. Abandon it and notify the nearest fire brigade
4. Pour any available liquid on it

2. Match the items in List A with the correct responses in List B. (5 marks)

SECTION B (70 Marks)

Answer all questions in this section.

3. (a) Define the term fire. (2 marks)

(b) Name the three components of the fire triangle and explain why removal of any one of them can extinguish a fire. (8 marks)

4. (a) What is firefighting? (2 marks)

(b) Explain four precautions that should be observed when using a portable fire extinguisher. (8 marks)

5. A truck carrying kerosene is involved in an accident and a fire breaks out. Explain the appropriate ways of extinguishing the fire and state why water should not be used. (10 marks)

6. (a) Define a flame. (2 marks)

(b) Differentiate between a luminous flame and a non-luminous flame using four characteristics. (8 marks)

7. Explain five reasons why a non-luminous flame is more suitable than a luminous flame for most heating activities in a chemistry laboratory. (10 marks)

8. (a) Name five parts of a Bunsen burner. (5 marks)

(b) Explain how a Bunsen burner produces a non-luminous flame. (5 marks)

9. Give a reason for each of the following practices. (10 marks)

1. The air holes of a Bunsen burner should be closed before lighting it.
2. A person should keep the face away from the top of the barrel when lighting a Bunsen burner.
3. Gas should not be allowed to escape for a long time without lighting the burner.
4. A fire extinguisher should be aimed at the base of a flame.
5. A fire blanket should be used when a person's clothes catch fire.

SECTION C (15 Marks)

Answer the question in this section.

10. During a school practical session, a student notices a small fire involving a flammable liquid near a Bunsen burner. Another student suggests pouring water on the fire, while a third student wants to use any available fire extinguisher. Using your knowledge of fire, firefighting and flames, explain how the students should respond safely. In your answer, consider the fire triangle, the class of fire, selection of an appropriate extinguisher, precautions during firefighting and actions to take if the fire becomes uncontrollable. (15 marks)

LEARNING HUB.TZ

CHEMISTRY EXAMINATION FORM ONE

TOPICAL EXAMINATIONS.

MATTER

NAME………………………………………..CLASS…………………………………………….……………TIME: 2¹/₂HRS

INSTRUCTIONS:-

1. This paper consists of sections A, and B

2. Answer all questions

3. All answers must be written in the spaces provided

4. All writings should be in blue/black inks except for drawings that should be in pencils

SECTION A: 20 MARKS

1. Choose and write the letter of the best answer in each of the multiples choices in the space provided;

1. Which one is the correct meaning of first aid kit;

1. An immediate help given to an accident victim before attending the hospital.

2. A small box consists of metal tools only.

3. A bag consists of books and chemicals.

4. A small box consists of different instruments and chemicals in assisting an accident victim.

2. What is chemistry?

1. The branch of science which deals with the study of life

2. The branch of science which deals with the study of energy, force, mechanics, waves and the structure of atoms and the physical universe.

3. The branch of science which deals with the study of properties, composition and structure of matter and the changes matter undergo.

4. The help that one is given before attending to the hospital.

3. What do you call an instrument which is used in holding chemicals and heating chemicals;

1. Measuring cylinder

2. Gas jar

3. Test tube

4. Funnel

4. When one wants to light the Bunsen burner, what is the first thing to do;

1. Light a match/wooden splint and hold it at the gas tap using the rubber tubing.

2. Close air hole and connect the burner to the gas tap using the rubber tubing.

3. Open the gas tap slowly to half way to fully open position.

4. Open the hole slowly

5. What is the best definition of Brownian motion?

1. Uniform movement of particles

2. A motion discovered by Robert Brownian

3. A random movement of particles of gas and liquid

4. A random movement of particles of gas and solid

6. Which of the following is the Latin name of mercury;

1. Hydragyrum B. Hydrogyrum C. Hydragum D. Hydrorum

7. The English name of Argentium is;

1. Gold B. Lead C. Sodium D. Silver

8. A metal that is usually in liquid form is called;

1. Mercury B. Bromine C. Iron D. Sulphur

9. A symbol which represents the substances which can catch fire easily is;

1. Flammable B. Toxic C. Explosive D. Radioactive

10. Factors in an experiment that can be manipulated to get desired results are called;

1. Controlled variables

2. Uncontrolled variables

3. Dependent variables

4. Independent variables

i	ii	iii	iv	v	vi	vii	viii	ix	x

4. Write the letter of the best match from column B against a name of the element in column A.

COLUMN A	COLUMN B
Sodium Potassium Mercury Silver Gold Chlorine Helium Neon Copper lead	Pb L Na Au Cu Cl Hg N Me Ag Co Ne He K P S

i	ii	iii	iv	v	vi	vii	viii	ix	x

SECTION B: 54 MARKS

4. (a) Why is the chemical symbol of sodium “Na” instead of “S”? ……………………………………………………………………………………………………….

(b) Mention the three rules of assigning symbols to elements

i. ………………………………………………………………………………………………

ii. ……………………………………………………………………………………………….

iii. ………………………………………………………………………………………………

4. (a) Give the reason to why the chemicals in the laboratory should be labelled and well closed after use. ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………..

(b) The shelves in the laboratory should be labelled and constructed in a way that it is at the eye level and not above the eye level. Give the reason behind the statement ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

4. (a) Write the 6 scientific procedure in a form of descending (from the last to the first) ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

(b) There is no solution of a problem without research. Prove the statement. ………………………………………………………………………………………………………………………………………………………………………………………………………………

4. Fill in the blanks in the below names of the elements;

1. H_dr_g_r_m

2. N_ t_ _um

3. _l_ m _um

4. _r_ en_ium

5. Pot_ _ _ium.

6. B_ r _ _ _ium

4. (a) What are the effect if on to fails to follow the following laboratory instructions;

5. Failure to follow instructions guided. …………………………………………………………………………………………..

6. Improper disposal of broken glass materials ……………………………………………………………………………………………….

(b) Write the functions of the following laboratory tools 2 functions;

Round bottomed flask

i. …………………………………………………………………………………………..

ii. …………………………………………………………………………………………..

Burette

i. ……………………………………………………………………………………….

ii. ……………………………………………………………………………………….

4. (a) Draw the diagrams of the following warning signs;

1. Toxic (ii) Flammable (iii) Radioactive

(b) Give the reason to why most of petrol stations and cars have areas written “NO SMOKING”?

……………………...................................................................................................................................................................................................................................................................................................................

4. (a) Draw a well labeled diagram of a luminous flame;

(b) Mention the regions of non – luminous flame.

4. (a) What is a compound? Give three examples of a compound.

2. What is a mixture? Give five examples of mixture

4. Write down six properties of a metal;

4. Give explanation on how many ways can metal and non metal be differentiated with proper examples and diagram where necessary.

CHEMISTRY FORM ONE TOPICAL EXAMINATION

CHAPTER 04: MATTER

TIME: 2 HOURS

Instructions

1. This paper consists of Sections A, B and C with a total of eleven (11) questions.
2. Answer all questions in Sections A and B.
3. Answer one (1) question from Section C.
4. All answers should be written clearly in the answer booklet.
5. All diagrams should be clearly drawn and labelled where necessary.

SECTION A (15 MARKS)

Answer all questions in this section.

1. Choose the correct answer in items (i)–(x). (10 marks)

(i) A learner places a stone in a measuring cylinder containing water and observes that the water level rises. This observation shows that the stone:

1. has colour.
2. occupies space.
3. can flow.
4. has no mass.

(ii) Which state of matter has a definite volume but takes the shape of its container?

1. Solid
2. Liquid
3. Gas
4. Plasma

(iii) Which description best represents particles in a solid?

1. Far apart and moving freely
2. Closely packed and vibrating about fixed positions
3. Close together and moving freely throughout the container
4. Widely spaced and completely motionless

(iv) When ice changes into liquid water, the process is called:

1. freezing.
2. condensation.
3. melting.
4. deposition.

(v) Which process involves a gas changing directly into a solid?

1. Sublimation
2. Deposition
3. Vapourisation
4. Melting

(vi) The irregular movement of smoke or pollen particles suspended in a fluid provides evidence that:

1. matter consists of moving particles.
2. all particles have the same mass.
3. liquids have a fixed shape.
4. solids can flow easily.

(vii) A perfume smell spreads from one part of a room to another mainly because of:

1. freezing.
2. diffusion.
3. deposition.
4. melting.

(viii) Which pair of conditions is essential for rusting of iron?

1. Water and oxygen
2. Water and nitrogen
3. Oxygen and oil
4. Carbon dioxide and heat

(ix) Which of the following is a physical change?

1. Burning charcoal
2. Rusting iron
3. Melting candle wax
4. Digesting food

(x) Gases can be compressed more easily than liquids because gas particles:

1. have large spaces between them.
2. are fixed in regular positions.
3. have no mass.
4. are tightly packed.

2. Match the items in List A with the correct responses in List B. (5 marks)

SECTION B (70 MARKS)

Answer all questions in this section.

3. (a) Define matter. (2 marks)

(b) State two characteristics that a substance must have to be regarded as matter. (2 marks)

(c) Name the four states of matter. (4 marks)

(d) Explain why a liquid is classified as a fluid while a solid is not. (2 marks)

4. Three closed containers P, Q and R contain the same substance in different physical states. In P, the particles are closely packed in fixed positions. In Q, the particles are close together but can move past one another. In R, the particles are widely separated and move freely.

1. Identify the state of matter in P, Q and R. (3 marks)
2. State one property of each state identified in (a). (3 marks)
3. Explain why the substance in container R fills the whole container. (2 marks)
4. Explain why the substance in container P is difficult to compress. (2 marks)

5. A student heats ice in a beaker until it becomes water and continues heating until steam is formed.

1. Name the change from ice to water. (1 mark)
2. Name the change from water to steam. (1 mark)
3. Describe what happens to the particles as the ice is heated until it becomes liquid. (3 marks)
4. Describe what happens to the particles as the liquid changes into gas. (3 marks)
5. Distinguish between sublimation and deposition. (2 marks)

6. (a) Define Brownian motion. (2 marks)

(b) Explain why pollen grains suspended in water move in an irregular zigzag manner. (3 marks)

(c) Define diffusion. (2 marks)

(d) A student opens a bottle of perfume at the front of a classroom. Explain why students at the back can smell it after some time. (3 marks)

7. Four clean iron nails are placed under the following conditions: nail A in ordinary water exposed to air; nail B in boiled water covered with a layer of oil; nail C in dry air containing anhydrous calcium chloride; and nail D in salt water exposed to air.

1. State the expected observation for each nail after several days. (4 marks)
2. Explain why boiled water is covered with oil in the experiment involving nail B. (2 marks)
3. State the function of anhydrous calcium chloride in the container with nail C. (2 marks)
4. State the conditions necessary for rusting of iron. (2 marks)

8. (a) Distinguish between a physical change and a chemical change. (2 marks)

(b) Classify each of the following as either a physical change or a chemical change:

1. Breaking a piece of chalk. (1 mark)
2. Burning a piece of wood. (1 mark)
3. Drying wet clothes in the sun. (1 mark)
4. Rusting an iron nail. (1 mark)

(c) State four differences between physical and chemical changes. (4 marks)

9. (a) Explain the role of changes of state in each of the following:

1. the water cycle. (2 marks)
2. refrigeration. (2 marks)
3. petroleum refining and distillation. (2 marks)
4. drying wet materials. (2 marks)

(b) Explain why the smell of hot food can usually be detected from a greater distance than the smell of cold food. (2 marks)

SECTION C (15 MARKS)

Answer one (1) question from this section.

10. Using the kinetic nature of matter, explain the arrangement, spacing and movement of particles in solids, liquids and gases. Relate these particle characteristics to the shape, volume and compressibility of each state. (15 marks)

11. During a science lesson, a learner notices that the smell of perfume gradually spreads throughout the classroom. The learner also observes that a metal object expands when heated.

1. Using the particulate nature of matter, explain how the perfume smell spreads throughout the classroom. (7 marks)
2. Using the kinetic nature of matter, explain why the metal object expands when heated. (8 marks)

LEARNING HUB.TZ

CHEMISTRY EXAMINATION FORM ONE

TOPICAL EXAMINATIONS.

SEPARATION OF MIXTURES

NAME………………………………………..CLASS…………………………………………….……………TIME: 2¹/₂HRS

INSTRUCTIONS:-

1. This paper consists of sections A, and B

2. Answer all questions

3. All answers must be written in the spaces provided

4. All writings should be in blue/black inks except for drawings that should be in pencils

SECTION A:

1. Choose the best option from the choices given below.

(i) When salt is dissolved in water, a uniform mixture is formed. The resulting

mixture is known as;

1. Solute

2. Solvent

3. Heterogeneous mixture

4. Solution

5. Suspension

(ii) The second step in scientific procedure is ………………

1. Data collection and analysis

2. Conclusion drawing

3. Formulation of hypothesis

4. Experimentation and observation

(iii) The following are examples of mixture except;

1. Milk

2. Sea water

3. Ethanol

4. Human blood

5. Soda

(iv) The reverse process of vapour changing to solid is known as ………………….

1. Deposition

2. Condensation

3. Freezing

4. Freezing point

(v) When anhydrous copper(II) sulphate is left on the glass turns blue. This confirms

presence of ………………………. in air;

1. Carbon dioxide

2. Dust particles

3. Water vapour

4. Noble gases

(vi) Decantation process involve …………………………

1. Saturation

2. Sedimentation

3. Melting

4. Distillation

(vii) When carbon dioxide gas is passed through the lime water, it turns lime water…….

1. Blue

2. Green

3. Whitish grey

4. Milk

(viii) The moving solvent in the chromatographic column is called …………………

1. Mobile phase

2. Stationery phase

3. Analyte

4. Chromatogram

(ix) The method of extracting oil from seed is known as ……………….

1. Chromatography

2. Oiling

3. Solvent extraction

4. Distillation

(x) When substance is heated and it changes directly from solid to vapour, this process is known as;

1. Condensation

2. Deposition

3. Sublimation

4. Evaporation

1. Match the items in List A with their corresponding responses in List B.

i	ii	iii	iv	v	vi	vii	viii	ix	x

SECTION B:

3. Supply the suitable word in the space provided;

1. …………………………… is a mixture of a pure metal with one or more other elements.

2. Brass is made by mixing ………………. and ……………………

3. Steel is made by mixing …………………… and …………………………….

4. A steel with higher contact of iron is called ……………………………

5. The liquid which mix together completely is known as …………………………

3. (a) Give three differences between compounds and mixture;

(b) Two differences between solution and suspension

3. Define the following term;

1. Air ………………………...................................................................................................................................................................................................................................

2. Saturated solution ………………………………………………………………………………………………………………………………………………………………………………

3. Unsaturated solution ……………………………………………………………………………………………………………………………………………………………………………..

4. Super – saturated solution ………………………………………………………………………………………………………………………………………………………………………………

5. (a) What is distillation ……………………………………………………………………………………………………………………………………………………………………………………

(b) Below is a set up of apparatus and equipments used in fractional distillation, name the parts labeled by letters from A to E.

(c) What is the main use of A in the diagram above? ………………………………….

(d) Give 3 examples of mixtures that can be separated through fractional distillation (i) ……………………………………………………………………………

(ii) …………………………………………………………………………….

(iii) ……………………………………………………………………………..

                                                                                                                        LEARNING HUB.TZ

CHEMISTRY EXAMINATION FORM ONE

TOPICAL EXAMINATIONS.

SEPARATION OF MIXTURES

NAME………………………………………..CLASS…………………………………………….……………TIME: 2¹/₂HRS

INSTRUCTIONS:-

1.    This paper consists of sections A,  and B
2.    Answer all questions
3.    All answers must be written in the spaces provided
4.    All writings should be in blue/black inks except for drawings that should be in pencils

SECTION A:

1.  Choose the best option from the choices given below.

 (i) When salt is dissolved in water, a uniform mixture is formed. The resulting  

      mixture is known as;

1.                   Solute 
2.                   Solvent
3.                   Heterogeneous mixture
4.                  Solution
5.                   Suspension

 (ii) The second step in scientific procedure is ………………

1.                   Data collection and analysis
2.                   Conclusion drawing
3.                   Formulation of hypothesis
4.                  Experimentation and observation

  (iii) The following are examples of mixture except;

1.                   Milk
2.                   Sea water
3.                   Ethanol
4.                  Human blood
5.                   Soda

(iv) The reverse process of vapour changing to solid is known as …………………. 

1.   Deposition
2.   Condensation
3.    Freezing
4.   Freezing point

(v) When anhydrous copper(II) sulphate is left on the glass turns blue. This confirms 

       presence of ………………………. in air; 

1.   Carbon dioxide
2.   Dust particles
3.    Water vapour
4.   Noble gases

(vi) Decantation process involve …………………………

1.           Saturation
2.             Sedimentation
3.            Melting
4.           Distillation

(vii) When carbon dioxide gas is passed through the lime water, it turns lime water…….

1.   Blue
2.               Green
3.    Whitish grey
4.   Milk

(viii) The moving solvent in the chromatographic column is called ………………… 

1.   Mobile phase
2.   Stationery phase
3.    Analyte
4.   Chromatogram

(ix) The method of extracting oil from seed is known as ……………….

1.   Chromatography
2.   Oiling
3.    Solvent extraction
4.   Distillation

(x) When substance is heated and it changes directly from solid to vapour, this process is known as;

1.    Condensation
2.    Deposition
3.     Sublimation
4.    Evaporation

(a)  Match the items in List A with their corresponding responses in List B. 

SECTION B:

3.    Supply the suitable word in the space provided;

(a)  …………………………… is a mixture of a pure metal with one or more other elements. 

(b)  Brass is made by mixing ………………. and ……………………

(c)  Steel is made by mixing …………………… and ……………………………. 

(d) A steel with higher contact of iron is called …………………………… 

(e)  The liquid which mix together completely is known as …………………………

4.    (a) Give three differences between compounds and mixture;

(b) Two differences between solution and suspension 

5.    Define the following term;

a)     Air ………………………...................................................................................................................................................................................................................................

b)     Saturated solution ………………………………………………………………………………………………………………………………………………………………………………

c)      Unsaturated solution ……………………………………………………………………………………………………………………………………………………………………………..

d)     Super – saturated solution ………………………………………………………………………………………………………………………………………………………………………………

e)     (a) What is distillation ……………………………………………………………………………………………………………………………………………………………………………………

(b) Below is a set up of apparatus and equipments used in fractional distillation, name  the parts labeled by letters from A to E. 

(c) What is the main use of A in the diagram above? ………………………………….

(d) Give  3 examples of mixtures that can be separated through fractional distillation (i) ……………………………………………………………………………

(ii) …………………………………………………………………………….

(iii) ……………………………………………………………………………..