Physical and chemical changes

Physical and Chemical changes

Physical changes-The changes that occurs in the physical properties of material like shape, size, colour, state, etc. These changes are reversible in nature. We can get back the same material without loosing its chemical nature once the physical change takes place. Examples for Physical changes - 1.Tearing of paper (shape and size of the paper changes ) 2. melting of ice( change in state) 3. dipping chalk in to coloured solution (change in colour) 4. Dissolving sugar in to water (change in shape of sugar particles)                                       5. Dissolving salt in to water Chemical changes_The changes that takes place due to the chemical reactions. These changes are irreversible in nature. After the chemical changes taken place the material will loose its nature and one or more new substances are formed. Examples for Physical changes - 1. Burning of paper 2. Burning of candle 3. Digestion of starch in mouth. 4. Rusting of iron. 5. Conversion of milk to curd