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Chemical Reactions and Equations
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30/08/2021 4:13 pm
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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.
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30/08/2021 4:14 pm
1. Evolution of gas.
For example: When sodium carbonate reacts with dilute hydrochloric acid, carbon dioxide gas is evolved.
2. Formation of a precipitate.
For example: When potassium iodide solution is added to a solution of lead nitrate, yellow precipitate of lead iodide is formed.