3
Question
Name and explain the changes that occur when a candle is burnt? [3 MARKS]
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Solution
Changes: 1 Mark
Explanation: 2 Marks
When a candle is burnt, two types of changes occur
i) Physical Change
ii) Chemical Change
When the candle is lit, the wax at the top melts. This is a physical change.
The wick absorbs liquid wax. The liquid wax vaporizes due to the heat produced by the flame. This wax vapour near to flame burns and gives new substances like Carbon Dioxide, Carbon soot, water vapour, heat, and light. This is an irreversible change.
Explanation: 2 Marks
When a candle is burnt, two types of changes occur
i) Physical Change
ii) Chemical Change
When the candle is lit, the wax at the top melts. This is a physical change.
The wick absorbs liquid wax. The liquid wax vaporizes due to the heat produced by the flame. This wax vapour near to flame burns and gives new substances like Carbon Dioxide, Carbon soot, water vapour, heat, and light. This is an irreversible change.
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