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How do we come to Know …

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How do we come to Know that a chemical reaction has taken place ?

Posted by Harshit Kumar 5 years, 8 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 8 months ago

The presence of any of the following changes helps us to determine that a chemical reaction has taken place.

Formation of new substance(s)
Change in state
Change in colour
Change in temperature
Formation of a precipitate
Evolution of a gas
For example, if on mixing two substances a gas is evolved, then we can say that a chemical reaction has taken place.

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