THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATION COUNCIL

CHEMISTRY FTNA 2013

SECTION B

 (i) The apparatus used for grinding granular chemicals in the laboratory include:

1. Crucible and watch glass
2. Mortar and pestle
3. Pestle and pair of tongs 
4. Spatula and basin

 (ii)  The substances that can be used to extinguish fire are:

1. Carbon dioxide and sand
2. Carbon dioxide and sugar
3. Nitrogen and sand
4. Nitrogen and water

 (iii) Which of the following electronic configurations are of metals?

A. 2:8:1 and 2:5

B. 2:8:2 and 2:6

C. 2:8:3 and 2:8:8:7

D. 2:8:6 and 2:8:8:7

 (iv) When sugar is dissolved in water, a uniform mixture is formed. The resulting mixture is called a:

1. Solute
2. Solution
3. Solvent
4. Suspension

 (v) Flammable chemicals are those which:

1. Burn skin
2. Catch fire easily
3. Explode
4. Extinguish fire

 (vi) Which of the following can be classified as a renewable source of energy?

1. Biomass
2. Coal
3. Coke
4. Petroleum

 (vii) The part of Bunsen burner that controls the amount of air coming in is called:

1. Air hole
2.  Barrel
3.  Collar 
4.  Jet

 (vii) The part of Bunsen burner that controls the amount of air coming in is called:

1. Air hole
2.  Barrel
3.  Collar 
4.  Jet

 (ix) The simplest formula of a compound formed when combining 13g of aluminum and 17g of chlorine is:

1. AlCl
2. _Al2Cl
3. Al₃Cl₂
4. AlCl₃

 (x) The second step in the scientific procedure is:

1. Data collection and analysis
2. Data interpretation
3. Experimentation and observation
4. Hypothesis formation