give one reason of each: (a) chemical reaction showing evolution of gas. (b) change in substance's colour during a chemical reaction
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a) baking soda and vinegar react and give carbon dioxide
b)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 chemical reaction.
b)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 chemical reaction.
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a) any chemical reaction needs some gas evolution to make it process further to get product.
for eg:- Zn + 2HCl ------> ZnCl2 +H2
b)it happens in some reaction and most commonly seen in many chemical reaction .
for eg:- CuSo4 + Fe --------> FeSo4 +CU
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