Physical Change

Those change in which only the  physical properties of the substance change but no new substance are formed  are called physical changes.

  • In the physical change substance do not change their identity but there occur only a change in some of their physical properties such as physical state shape and size.
  • There fore after the physical change has occurred the substance can be easily convert back to their original form by some physical process.
  • Thus the physical change are temporary and hence can be easily reversed.

Example of physical changes:

  • Melting of ice to form water and freeze of water to form ice.
  • When ice in contact with heat or energy it convert into water.
  • Though both ice and water look different they are made up of water molecule.
  • In other word no new substance is form during melting of ice.

Boiling of water to form steam and condensation of steam to form water.

  • When water is heated to form steam.
  • Though both ice and water look different they are made up of water molecule.
  • In other word no new substance is form during boiling of water to form steam.

Preparing a Solution:

  • Suppose we dissolved some common salt inwater.
  • The common salt disappeared to form slat solution.
  • Thus a change has taken place during formation of salt solution

Breaking a glass tumbler:

  • When a glass tumbler beak , it form number of small pieces , but each smallpiece number of glass particles.
  • Thus during breaking of glass substance no new substance are formed but shape , size of the substance are change.
  • Thus breaking of glass tumbler is physical change.

Question Answer:

1) What is Physical change?

Answer: Those change in which only the  physical properties of the substance change but no new substance are formed  are called physical changes.”

2) Write properties of physical change?

Answer: • In the physical change substance do not change their identity but there occur only a change in some  of their physical properties such as physical state shape and size.

  • There fore after the physical change has occurred the substance can be easily convert back to their original form by some physical process.
  • Thus the physical change are temporary and hence can be easily reversed.

3) Give example of physical change?

Answer: 1) Melting of ice to form water  and freeze of water to form ice.

  • When ice in contact with heat or energy it convert into water.
  • Though both ice and water look different they are made up of water molecule.
  • In other word no new substance is form during melting of ice.

                   2) Breaking a glass tumbler:

  • When a glass tumbler beak , it form number of small pieces , but each small piece number of glass particles.
  • Thus during breaking of glass substance no new substance are formed but shape , size of the substance are change.

Thus breaking of glass tumbler is physical change.


Leave a Reply

Your email address will not be published. Required fields are marked *

4 × 3 =