Candidate's Examination Number . . . . . . . . . . .  . .

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL

FORM TWO SECONDARY EDUCATION EXAMINATION, 2013

0032 CHEMISTRY

Time: 2½ HOURS

INSTRUCTIONS

1. This paper consists of sections A, B and C.
2. Answer ALL questions.
3. Write your examination number at the top right corner of every page.
4. ALL writing must be in black or blue ink EXCEPT diagrams which must be in pencil.
5. Cellphones and calculators are not allowed in the examination room.
6. The following atomic masses may be used: 

• H = 1, O = 16, C = 12, Na = 23, S = 32, Ca = 40

FOR EXAMINER'S USE ONLY

SECTION A (10 MARKS)

1. Write the letter of the correct answer in the box provided for each of the following items:

(i) The apparati used for grinding granular chemicals in the laboratory include:

1. crucible and watch glass
2. mortar and pestle
3. pestle and pair of tongs
4. spatula and basin.

(ii) The substances that can be used to extinguish fire are:

1. carbon dioxide and sand
2. carbon dioxide and sugar
3. nitrogen and sand
4. nitrogen and water.

(iii) Which of the following electronic configurations are of metals?

1. 2:8:1 and 2:5
2. 2:8:2 and 2:6
3. 2:8:3 and 2:8:8:1
4. 2:8:6 and 2:8:8:7

(iv) When sugar is dissolved in water, a uniform mixture is formed. The resulting mixture is called a:

1. solute
2. solution
3. solvent
4. suspension.

(v) Flammable chemicals are those which:

1. burn skin
2. catch fire easily
3. explode
4. extinguish fire.

(vi) Which of the following can be classified as a renewable source of energy?

1. Biomass
2. Coal
3. Coke
4. Petroleum

(vii) The part of the Bunsen burner that controls the amount of air coming in is called:

1. air hole
2. barrel
3. collar
4. jet.

(viii) An element X with atomic number 16, belongs to:

1. period 3, group III, valency of 2
2. period 3, group VI, valency of 2
3. period 3, group VI, valency of 6
4. period 6, group VI, valency of 6

(ix) The simplest formulas of a compound formed when combining 13g of aluminium and 17g of chlorine is:

1. AlCl
2. Al₂Cl
3. Al₃Cl₂
4. AlCl₃

(x) The second step in the scientific procedure is:

1. data collection and analysis
2. data interpretation
3. experimentation and observation
4. hypothesis formulation