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Classification of Change: Physical Changes

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notes

Physical Changes:

Physical change, a substance undergoes changes only in its physical properties such as shape, size, colour and state, and no new substance is formed.

Characteristics of Physical Changes:

The physical changes are temporary changes which can be easily reversed to form the original substance. In such a change, no new substance is formed.
Thus, we noticed that the important characteristics of physical changes are as follows:

  • No new substance is formed in this change.
  • It is a temporary change and is generally reversible.
  • A temporary change in colour may take place.
  • Very little energy (heat, etc) is either absorbed or evolved.

Difference between Physical Change and Chemical Change:

Physical change Chemical change
Physical properties like state, colour, volume etc changes. The chemical composition and properties changes.
No new substance is formed. It results in the formation of a new substance.
Usually reversible. Usually irreversible.
Generally, the Original form of the substance can be regained by physical methods. Original form of the substance cannot be regained by physical methods.
Eg. Melting of wax Eg. Burning of candle

Some other examples of Physical change:

  • Chopping vegetables

  • Dissolving sugar into water

  • water freezing to ice

  • Crumpling of paper

  • Reshaping soft clay

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Physical and chemical change [00:10:39]
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