Question

Write the characteristics of a chemical change class 7 science​

Answer 1

Answer:

There are five signs of a chemical change:

• Color Change.
• Production of an odor.
• Change of Temperature.
• Evolution of a gas (formation of bubbles)
• Precipitate (formation of a solid)

Answer 2

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Characteristics of Chemical reaction

1)Evolution of gas. Some chemical reactions are characterised by the evolution of gas.

2)Formation of precipitate. Some chemical reactions are characterised by the formation of precipitate.

3)Change in colour. Some chemical reactions are characterised by change in colour.

4)Change in temperature.

5)Change of state.