THE UNITED REPUBLIC OF TANZANIA MINISTRY OF EDUCATION AND VOCATIONAL TRAINING

FORM TWO SECONDARY EDUCATION EXAMINATION, 2004

0032 CHEMISTRY

TIME: 2 HOURS

INSTRUCTIONS

1. This paper consists of three sections A, B and C.

2. Answer all questions in spaces provided for each question.

3. Write your examination number on the top right hand corner of every page.

4. All writing must be done in “black or blue pen” except for the diagrams which must be in pencil.

5. Cellphones and calculators are not allowed in the examination room.

6. The following constants may be used:

Atomic masses: H = 1, C = 12, O = 16, and Na = 23.

SECTION A

1. Write down the letter of the most correct response for each of the following questions:

(i) Which of the following reactions represent chemical change?

1. Heating a solid ammonium chloride in a test tube;
2. Burning candle in air;
3. Adding sodium chloride solid in water;
4. Putting ink on a filter paper.

(ii) Which of the following sets of symbols of elements stand for a single element?

(iii) An element 'A' of electronic configuration 2:8:3 combines with an element 'B' of configuration 2:6.

The chemical formula of the compound is: 

1. B₆A₃
2. A₃B₃
3. A₂B₃
4. A₃B₂

(iv) Calcium iron and calcium atom both have:

1. Same physical properties
2. Same number of protons
3. Same number of electrons
4. Same electronic configuration

(v) If a Bunsen burner flame produces much soot, which is the correct conclusion?

1. The air hole is closed
2. The burner gas jet is big
3. The air hole is fully opened
4. The gas supply is poor

(vi) The atomic number of an element is the:

1. Number of protons and neutrons
2. Number of neutrons
3. Mass number
4. Number of protons

(vii) If water does not easily form lather with soap, it is because of the presence of:

1. Calcium and magnesium salts
2. Calcium sulphate
3. Sodium and calcium salts
4. Ammonium and Magnesium salts

(viii)This mixture of substance can extinguish fire:

1. Oxygen and Nitrogen
2. Carbon dioxide and sand
3. Carbon dioxide and Hydrogen
4. Hydrogen and Neon

(ix) Which of the following sets of processes represent uses of oxygen gas?

1. Welding, ice melting, magnetization
2. Mountaineering, sublimation, freezing
3. Glass cutting, desiccation, welding
4. Diving, welding, mountaineering

(x) The reaction that takes place when NaHC03 is heated in the laboratory can be described as: 

1. Combination
2. Decomposition
3. Replacement
4. Double decomposition