Which of the following is a chemical change?

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Burning of candle

Digestion of food

Cooking of food

All of the above

answer is D.

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Detailed Solution

All the above are examples of a chemical change. A physical change is a change in which a new substance is not formed. Physical changes are generally reversible, but sometimes irreversible. A chemical change is a change in which a new substance is created by a chemical reaction. Burning candles, digesting food, and cooking food are chemical changes. It is a chemical change that burns candles. After burning, wax is produced and

{CO}_{2}

is released, so the wax cannot be returned to the candle. Food digestion is a chemical change. This is because during digestion, new substances that cannot be converted to food , are formed. Similarly, cooking of food is chemical change because cooked ingredients cannot be converted back to their original ingredients.

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