THE UNITED REPUBLIC OF TANZANIA MINISTRY OF EDUCATION AND CULTURE

FORM TWO SECONDARY EDUCATION EXAMINATIONS, 2005

0032 CHEMISTRY

TIME: 2.00 HOURS.

INSTRUCTIONS

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

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

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

4. All writings must be in black or blue pen except for diagrams which must be in pencil.

5. Cell phones are not allowed in the examination room.

6. The following constants may be used

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

SECTION A (10 Marks)

This section consists of ten (10) multiple choice items. You are required to answer all questions in this section.

1. Write down the letter of the most correct response in the box provided in each question.

(i) The states of matter are:-

1. Element, gas and mixture.
2. Liquid, moisture and element.
3. Water, moisture and solid.
4. Gas, liquid and solid.

(ii) A Substance which absorbs water/moisture from the atmosphere and forms a solution is called:

1. Efflorescent.
2. Amphoteric.
3. Hygroscopic.
4. Deliquescent.

(iii) The correct statement about metals is that:-

1. React with acids to give gases.
2. React with acids to give hydrogen gas.
3. Have more than one valency.
4. All have magnetism.

(iv) In Chemistry, experiments test:

1. Data.
2. Problems.
3. Hypotheses.
4. Observation.

(v) In any chemical change:

1. Energy is not created.
2. Energy is either absorbed or given out.
3. Energy is created.
4. Energy is neither liberated nor absorbed.

(vi) Which of the following sets of apparatus are suitable for measuring the volume of solutions?

1. Burette, pipette and beaker.
2. Burette, pipette and conical flask.
3. Measuring cylinder, burette and pipette.
4. Burette, flat bottomed flask and pipette.

(vii) The substance that can burn your skin is best described as:

1. Flammable.
2. Corrosive.
3. Explosive.
4. Toxic.

(viii) Sublimation is the process whereby

1. Substances float in liquids when heated.
2. Substances change directly to vapour without the liquid state when heated.
3. A mixture of solid substances is separated by heating.
4. An alcohol is separated from water.

(ix) Which of the following chemical species have the same number of electrons.

1. K⁺, Ca²⁺, Cl^- and Ar
2. Cl, Be and O²
3. O^2-, Ca²⁺ and Mg²⁺
4. Na⁺, Mg²⁺, Be²⁺ and Li

(x) The process of chlorination in water treatment aims at.

1. Killing micro organisms.
2. Syrup making.
3. Forming suspension.
4. Removing bad odours.