Give an example of a physical change and explain the mechanism.

In a physical change, no new substance is formed. Hence, the tearing of paper is a physical change.

Physical change

Properties such as shape, size, colour and state of a substance are called its physical properties. A change in which a substance changes its physical properties is called a physical change. A physical change is generally reversible. In such a change, no new substance is formed.

Examples of Physical Changes

  • Crushing a can.
  • Melting an ice cube.
  • Boiling water.
  • Mixing sand and water.

Cut a piece of paper into four square pieces. Cut each square piece further into four square pieces. Lay these pieces on the floor or a table so that the pieces acquire the shape of the original piece of paper. Here is the property of the paper changed.

Chemical change

A change in which one or more new substances are formed is called a chemical change. A chemical change is also called a chemical reaction. All new substances are formed as a result of chemical changes. For example, digestion of food in our body, ripening of fruits, fermentation of grapes, etc., happen due to a series of chemical changes.

Examples in everyday life are:

  • Burning of paper and log of wood.
  • Digestion of food.
  • Boiling an egg.

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