CBSEEnglish Medium Class 7
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Syllabus

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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Related QuestionsVIEW ALL [18]

Classify the changes involved in the following processes as physical or chemical changes:

Photosynthesis

Dissolving sugar in water

Burning of coal

Melting of wax

Beating aluminium to make aluminium foil

Digestion of food

Explain why burning of wood and cutting it into small piece are considered as two different types of changes.

Fill in the blanks in the following statements:

Changes in which only _____ __ properties of a substance change are called physical changes.

State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.

Cutting a log of wood into pieces is a chemical change. (True/False)

When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.

Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a 

Which of the following is a physical change?

Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and then a small amount of hot water was added to dissolve it (step I). On cooling, beautiful blue coloured crystals got separated (step II). Step I and Step II are:

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