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CBSE Video lectures for download


=Substance and Type of Substances

=Mixture, Homogeneous Mixtures, Heterogeneous mixtures

=Solution, Properties of Solution

=Suspension, Properties of Suspension

=Colloid, Properties of Colloid

=Tyndall Effect

=Method of Separating the Component of Mixture

=obtain the coloured component (dye) from a ink

=Use of separating funnel




=Method of Simple Distillation

=Method of Fractional Distillation

=Obtain Different Gases from Air

=Crystallisation, Application of Crystallisation

=Physical Change

=Chemical Change

=Diagram of water purification system

=Differentiate between mixtures and compounds.

=Classification table of matter.


What is a physical change? Give example.

What is a physical change? Give example.
Answer: A change which occurs without a change in the composition and chemical nature of the substance is called a physical change. It means that there is a change only in the physical properties of the substance. Properties like colour, hardness, rigidity, fluidity, density, melting point and boiling point are known as physical properties. Melting of ice or boiling of water is a physical change because ice, water and water vapours are chemically the same substance that is H2O.

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What is a physical change? Give example.

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