Give two examples. (a) change substances color during a chemical reaction
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1. when AgBr(in lemon yellow) is placed in sunlight it changes it color to grey to form Ag and Br. it's a decomposition reaction.
2. when copper (in brown color) is burned in presence of air, it forms black colored CuO. it's an example for combination reaction.
2. when copper (in brown color) is burned in presence of air, it forms black colored CuO. it's an example for combination reaction.
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Following are the two examples of substance that change its color during a chemical reaction
(a) Phenolphthalein
(b) Hydrate Copper Carbonate
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