Q. 46 B

What is a chemical change?

Give two examples of chemical changes.

Answer :

Those changes in which new substances are formed, are called chemical changes. A chemical change is also called a chemical reaction. In a chemical change, the substances involved, change their identity . They get converted into entirely new substances. The new substances usually cannot be returned to their original form. This means that chemical changes are usually irreversible.

Burning of candle and burning of hydrogen in oxygen to form water.

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The rusting of an iron object is called:

Lakhmir Singh & Manjit Kaur - Chemistry