Why it is so that chemical and physical changes both appear In burning of candle.
Answers
Physical changes in burning candle On heating, candle's wax melts, it is a physical change. Since, it again turns into solid wax on cooling. The change is reversible. Chemical changes in burning candle The wax near to flame burns and gives new substances like carbon dioxide, carbon soot, water vapours, heat and light.
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Answer: Burning of candle is a chemical change.But, melting of the candle wax is a physical change.
Explanation:When a candle is burnt, the middle thread comes in contact with fire and turn into ashes. Hence, new substance is formed (i.e.,Thread to ash).And when new substances are formed, then it is a chemical change.
While the candle is burning, it's wax also starts to melt. When the max melts, it can be reshaped into a candle and also, no new substance is being formed. Thus, it is also a physical change.