perform an activity to show any one type of chemical reaction and write the procedure and observation
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The following observations in an activity may suggest that a chemical reaction has taken places.
∙ Change in state
∙ Change in colour
∙Evolution of a gas
∙ Change in temperature
(i) Calcium oxide reacts vigorously with water to produce calcium hydroxide. During this process, a large amount of heat is also evolved, which increases the temperature of the system. This confirms that a chemical reaction has taken place.
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