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

ans; a chemical change can be confirmed by the following;
1) change in temperature
eg; calcium oxide reacts vigorously with water to produce calcium hydroxide along with evolution of large amount of heat.

2) evolution of gas
eg; Zn reacts with H2so4 to form ZnSO4 and H2
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