Question

given one example of chemical reaction 1) evoluation of a gas. 2) change in colour

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Answer 1

Answer:

1)One of the most common gas evolution reactions is an acid base reaction, where an acid is combined with a base to produce water and carbon dioxide. ... The atoms of these reactants are rearranged when they come into contact with each other and reassembled to form water, carbon dioxide, the gas product, and sodium citrate.

2)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.

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