Write an activity to show that changes in colour occurs due to chemical reactions.
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Explanation:
When copper reacts with the elements (oxygen, water and carbon dioxide), it turns from its element color of reddish-brown to green. This chemical reaction is hydrated copper carbonate, and a famous example of it is the Statue of Liberty.
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Answer:
when CO2 Is passed through a solution of lime water , the lime water turns milky due to the formation of CaCO3.The milkiness disappears on passage of excess CO2 due to the formation of soluble Ca(HCO3).
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