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• Take a few zinc granules in a conical ...

• Take a few zinc granules in a conical flask or a test tube.
• Add dilute hydrochloric acid or sulphuric acid to fig.

CAUTION : Handle the acid with care.
Touch the conical flask or test tube. Is there change in its temperature ?

Text Solution

Verified by Experts

Yes, its temperature is slightly increased.
Note: From the above three activities, we can conclude the following observations that help us to determine together a chemical reaction has taken place
1. change in state
2. change in colour
3. evolution of gas
4. change in temperature.
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