THE UNITED REPUBLIC OF TANZANIA 

NATIONAL EXAMINATIONS COUNCIL FORM TWO NATIONAL ASSESSMENT 

032 CHEMISTRY 

Time: 2:30 Hours Friday, 17th November 2017

Instructions

1. This paper consists of sections A and B with a total of ten (10) questions. 

2. Answer all questions in the spaces provided. 

3. All writing must be in black or blue ink except diagrams which must be in pencil. 

4. All communication devices and calculators are not allowed in the examination room. 

5. Write your Examination Number at the top right corner of every page. 

6. The following atomic masses may be used: H = 1. N = 14.0 = 16. S = 32. Ca = 40.

(i)  Which statement gives a clear meaning of Chemistry?

1. The study of matter in relation of energy
2. The study of nature and properties of matter
3. The study of matter and arrangement of particles
4. The study of matter and chemical reaction

(ii)   The mass number of an atom is determined by:

1.  protons and neutrons 
2.  protons and electrons 
3.  neutrons and electrons 
4. protons alone

(iii)Which of the following is a metal?

1. Water 
2. Chlorine
3. Sodium  
4.  Nitrogen

(iv)Air entering the Bunsen burner barrel can be controlled by

1.  metal ring 
2.  air hole
3.  metal jet 
4. air ring

(v)    How many atoms are there in a water molecule

1. Two     
2. . Three 
3.  Four      
4. Five

(vi)Which neutral atom has the same number of eletrons as Mg²+?

1. Magnesium 
2.  Sodium 
3.  Neon 
4.  Argon

(vii)         The appropriate extinguisher used to put off fire caused by cooking oil is:

(vii)         The appropriate extinguisher used to put off fire caused by cooking oil is:

1. Water extinguisher
2. Carbon extinguisher
3.  Wet chemical extinguisher
4. Dry air extinguisher

(viii)      A non-luminous flame is obtained if the hole is:

1. fully opened 
2. partially opened 
3.  closed 
4.  half opened

(ix)Which is the least abundant gas in the air?

1. Nitrogen     
2.  Oxygen
3.  Neon     
4.  Carbon dioxide

(x)    The process which produces energy in form of heat and light is called:

1. decomposition 
2. combustion
3.  distillation 
4.  sublimation