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State two disadvantages of incomplete combustion.
(i) Incomplete combustion of a fuel produces a poisonous gas called carbon monoxide and unburnt carbon particles which cause pollution.
(ii) Incomplete combustion of a fuel produces less heat and hence leads to the wastage of fuel.
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.
Can the process of rusting be called combustion ? Discuss.
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