Write the characteristics of a chemical change.

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Solution

Definition
In a chemical change, new substances are formed.
Characteristics of a chemical change :
One or more new substances are formed.
A lot of energy is either absorbed or liberated.
A gas may be formed in a chemical change.
Sound may be produced by a chemical change.
A chemical change is permanent.
A chemical change is usually cannot be reversed.
Example
Evolution of a gas
formation of a precipitate
Change in colour
Change in temperature

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