Which of the following causes acid rain ?

• carbon dioxide

• sulphur dioxide

• carbon monoxide

• oxides of sulphur and nitrogen

Compare LPG and wood as fuels.

Give reasons :

Water is not used to control the fire involving electrical equipment.

Give reasons :

LPG is a better domestic fuel than wood.

Give reasons :

Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.

Make a labelled diagram of candle flame.

Name the unit in which the calorific value of a fuel is expressed.

Explain how CO₂ is able to control fires.

It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.

Which zone of a flame does a goldsmith use for melting gold and silver and why ?

In an experiment 4.5 kg of a fuel was completely burnt. The heat produced was measured to be 180,000 kJ. Calculate the calorific value of the fuel.