Especially For Students of 3M, 3A and 3 S( Also open to other form 3 classes)

Instruction: Write down all your answers in a piece of paper with your name and your class.There are 10 questions for you. Hand in your answers to me on Monday 15th June 2009.

Qst 1.

Write down the compound that forms in the following processes:

a) Combustion of hydrogen in the air: .........................................................................

b) Combustion of iron filings and sulphur:.....................................................................

Qst 2.

Name two substances that are used in the purification of water in public water purification plants.

Qst 3.

Name the products when a candle is burnt.

Qst 4.

Two cars collide in an accident.What energy do the cars have before the accident? What can happen to the energy after the accident?

Before accident:..........................................................

After accident : ..........................................................,  ............................................................

Qst 5.

....................................... is a process of transfer of heat from a heat source to the surrounding without the presence of any medium.

Qst 6.

Pellagra is a disease that caused by deficiency of .......................................

Qst 7.

Write down the equation for 

a) respiration:

b) photosynthesis :

Qst 8.

Oxygen cycle is the continuous process of taking and returning oxygen into the atmosphere.

Name 4 processes that use oxygen in the atmpsphere.

Qst 9.

Briefly explain how do you  test :

a) hydrogen gas; .......................................................................................

b) oxygen gas:...........................................................................................

c) carbon dioxide gas: ................................................................................

Qst 10.

A worker weighing 60 kg carries 10 kg load to a place 3m high. Calculate the energy used by the worker.

THE END