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Page 1

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Combustion of a hydrocarbon candle

When a fuel burns in air in reacts with oxygen to form
carbon dioxide and water vapour. This is what a candle
releases, as candle wax is only made up of carbon and
hydrogen elements.

Candle wax + oxygen carbon dioxide + water


Page 2

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Hydrocarbon + oxygen Carbon dioxide + water

Test for water

A piece of blue cobalt chloride paper turns pink in the
presence of water.

Test for carbon dioxide

Limewater becomes cloudy and white when carbon dioxide
bubbled through it.


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