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Standard VII
Chemistry
Chemical Change
Question

Which is an example of a chemical change?
  1. The melting of ice
  2. The burning of wood
  3. The grindig of salt crystals powder
  4. The evaporation of water from a sea

A
The melting of ice
B
The burning of wood
C
The grindig of salt crystals powder
D
The evaporation of water from a sea
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Solution
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A change in which a new substance is formed is called a chemical change.
Examples of chemical change are digestion of food, ripening of fruit, burning of wood.
The burning of wood is a chemical change because it is always accompanied by the production of heat.
Melting of ice grinding of salt crystals to powder and evaporation of water from the sea are all physical changes because no new substances are formed.

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