Question

Write any two observations in an activity which
may suggest that a chemical reaction has taken
place. Give an example in support of your answer.​

Answer 1

Answer:

1) Change of temperature

2) Change of colour

Explanation:

Example of 1st is-

CaO+H2O gives Ca(OH)2

It is an exothermic reaction.

Example of 2nd is-

Zn+CuSO4 gives Zn(SO4)+Cu

Here, the colour of blue copper sulphate changes to colorless solution of zinc sulphate.

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