THE UNITED REPUBLIC OF TANZANIA MINISTRY OF EDUCATION AND VOCATIONAL TRAINING

FORM TWO SECONDARY EDUCATION EXAMINATION, 2009

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 correct answer against each question.

(i)The fixed volume (20 cm³) of distilled water in the laboratory can be measured by using:

1. Beaker 
2. Burette
3. Pipette
4. Small measuring cylinder

(ii) Domestic utensils made of iron undergo rusting when exposed to:

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

(iii) The source of energy which when used can be made to be put into use again is known as:

1. Fuel 
2. Non-renewable energy
3. Renewable energy
4. Solar energy

(iv) A student who gets burnt accidentally in the chemistry laboratory would be given one of the following as first aid:

1. Antibiotic solution 
2. Nitric acid
3. Petroleum jelly
4. Potassium permanganate

(v) The chloride ion (Cl^-) differs from chlorine atom because chloride ion has:

1. Less electrons 
2. Less protons
3. More electrons 
4. More protons

(vi) The percentage by mass of nitrogen in (NH₄)₂CO₃ is:

1. 28.0 
2. 29.1
3. 37.5 
4. 96.0

(vii) The elements which are found in group VIII of the periodic table are known as:

1. Metals
2. Noble gases
3. Non-metals
4. Right elements

(viii) Isotopes are atoms which have:

1. Different mass number
2. Different number of electrons
3. Different number of protons
4. The same number of neutrons

(ix) The process used to separate a mixture of salt and water is:

1. Evaporation
2. Filtration
3. Simple distillation 
4. Sublimation

(x) Which of the following chemical species have the same number of electrons?

1. Cl, Be, He and O^2-
2. K⁺ , Ca²⁺ , Cl^- and Ar
3. Na⁺ , Mg²⁺ , C1³ and Ar
4. O^2- , F^- , S^2- and Cl^-