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Q.

Is it true that burning candles involves both physical and chemical changes?


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a

True

b

False  

answer is A.

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Detailed Solution

The above statement is true.
Physical Modifications: Candle wax melts when heated. Because after cooling, it solidifies once more into the wax. Therefore, wax melting and wax vaporization are physical changes.
Chemical Changes: When the wax is near a flame, it burns, releasing new gases like carbon dioxide and soot as well as heat and light.
Thus, both the changes are accompanied by the burning of the candle. 
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Is it true that burning candles involves both physical and chemical changes?