Question

write any two observation in an activity which suggests that a chemical reaction has taken place . give an exampal for each​

Answer 1

Answer:

1) Change in smell

2) Formation of a precipitate

Explanation:

Examples-

Thermal decomposition of ferrous sulphate, in this reaction, Sulphur dioxide and sulphur trioxide forms which have a smell of burning sulphur.

Barium hydroxide reacts with sodium sulphate to form Barium sulphate and sodium chloride.

Here, Barium sulphate is a white precipitate.

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