Question
Define physical and chemical changes.
Solution
Physical change.: Physical change is a temporary change in which the composition and chemical nature of the substance remains the same but the state of the substance and physical properties changes. For example, when ice changes into water and water changes into vapours. All have different appearance and display different physical properties but they are chemically same.
Chemical change. A chemical change is a permanent change in which not only physical properties but chemical properties also change. This is because new substance/s is formed in a chemical change. Burning of candle is a chemical change. Here both the physical and chemical changes are taking place and new substances are formed.
