Question

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

Answer 1

Answer:

For example: Calcium oxide reacts vigorously with water to produce calcium hydroxide. ... In this reaction, calcium carbonate breaks down to form calcium oxide and carbon dioxide. Here, evolution of the gas (carbon dioxide) confirms that a chemical reaction has taken place.

Answer 2

Explanation:

Ripening of fruit is a change where chemical reaction takes place.Respiration and photosynthesis are the two processes where

chemical reaction takes place.

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