Give an example of a chemical reaction for each of the following situation
1 a change in colour is observed
2 a gas is evolved
3 sound is produced
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1) Color changes from blue to light green. Copper reacts with oxygen, H2O and CO2 to give copper carbonate, which changes color from brown to blue or blue green. Rusting, blackening of surfaces of cut vegetables and fruits are other examples of change of color in a chemical reaction.
2) When limestone and HCl react with each other, carbon dioxide gas is evolved.
3) Burning of crackers. Burning of hydrogen gives out popping sound.
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