THE UNITED REPUBLIC OF TANZANIA MINISTRY OF EDUCATION AND VOCATIONAL TRAINING

FORM TWO SECONDARY EDUCATION EXAMINATION, 2003

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

This section consists of multiple choice items (i) — (ii). You are required to answer all questions in this section.

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

(i) Chemistry is one of the sciences which deals with:

1. Alkalinity and basicity of substances.
2. The study of body cells.
3. Composition, properties and behaviour of matter. 
4. Chemical changes.

(ii) One isotope of an element has atomic number A and mass number M. How many neutrons are contained in the nucleus of its atom?

1. M
2. A
3. A-M
4. M-A

(iii) In the diagram T represents a:

1. Bunsen burner flame
2. Region of unburnt gas
3. Zone of complete combustion
4. Gas burning

(iv) The neutral point in that pH scale is:

1. 0.7 
2. 7
3. 6
4. 8.0

(v) If the element M in the group I combines with element X of group VI the formula of the compound formed is:

1. MX₂ 
2. MX₀
3. X₂M
4. M₂X

(vi) Group seven elements are known as:

1. Alkali metals
2. Transition metals
3. Alkaline earth metals
4. Halogens

(vii) The simplest ionic equation which summarizes the process of neutralization is:

1. H⁺ + Nao  → H₂O + Na
2. NaOH + CI  → NaCI
3. H⁺ + OH  → H₂O
4. Na⁺CI^-  → NaCI

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

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

(ix) A pipette is used for:

1. Measuring distance of length
2. Measuring specific volume of liquids
3. Measuring volumes
4. Heating liquid

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

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