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

THE UNITED REPUBLIC OF TANZANIA, NATIONAL EXAMINATIONS COUNCIL

FORM TWO SECONDARY EDUCATION EXAMINATION, 2012

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

SECTION A (10 MARKS)

Answer ALL questions from this section.

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

(i) All domestic utensils made of iron undergo rusting when exposed to:

1. Air and fire
2. Air and oil
3. Air and water
4. Water and oil

(ii) When a small amount of common salt is dissolved in a glass of water, the mixture formed is:

1. Heterogeneous
2. Homogeneous
3. Immiscible
4. Suspension

(iii) A chemist should acquire all of the following skills except:

1. Experimentation
2. Observation
3. Problem identification
4. Surgery

(iv) An important property of oxygen which distinguishes it from other gases is that it:

1. Burns and supports combustion
2. Burns but does not support combustion
3. Neither burns nor supports combustion
4. Supports combustion but does not burn

(v) The process of chlorination in water treatment aims at:

1. Forming suspension
2. Killing micro-organisms
3. Making syrup
4. Removing bad odour

(vi) One of the following is not correct about coke being a better fuel than coal as it:

1. Does not produce carbon dioxide gas
2. Does not produce poisonous gas
3. Has a higher heat content
4. Is clean and smokeless

(vii) Class E fire can best be extinguished by using:

1. Carbon dioxide
2. Fire blanket
3. Sand
4. Water

(viii) The following is a set of apparatuses which are used for heating:

1. Crucible, test tube, evaporating dish
2. Evaporating dish, tongs, crucible
3. Test tube, evaporating dish, tongs
4. Tongs, crucible, test tube

(ix) Which of the following methods can be used to get oil from cotton seeds?

1. Decantation
2. Distillation
3. Grinding and distillation
4. Grinding followed by squeezing

(x) Which of the following apparatuses is suitable for measuring volumes of smaller quantities of liquids?

1. Beaker
2. Burette
3. Conical flask
4. Measuring cylinder