Question

What are the characteristics of chemical change? Explain each of them with examples.​

Answer 1

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Some chemical reactions are characterised by the evolution of gas. For Ex:1)Reaction between zinc and dilute sulphuric acid to form hydrogen gas. 2)Reaction between sodium carbonate and dilute hydrochloric acid to form carbon dioxide gas. Some chemical reactions are characterised by the formation of precipitate.

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Answer 2

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Some chemical reactions are characterised by the evolution of gas.

For Ex:1)Reaction between zinc and dilute sulphuric acid to form hydrogen gas.

2)Reaction between sodium carbonate and dilute hydrochloric acid to form carbon dioxide gas. Some chemical reactions are characterised by the formation of precipitate.

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