question_answer

    Distinguish between physical change and chemical change.

Answer:

    

Physical   change	Chemical change
1.In a physical change only physical properties such as colour, physical state, density, volume, etc. Change; chemical properties remain unchanged	1.In a chemical change, the chemical composition and chemical properties undergo a change
2. No new substance is formed in a physical change	2. A new substance is formed in a chemical change
3. Very little or no energy in the from of heat, light of sound is usually absorbed of give out in a physical change.	3. A chemical change is always accompanied by absorption or evolution of energy
4.A physical change is a temporary change	4.A chemical change is a permanent change
5. The original from of substance can be regained by simple physical methods.	5.original substance can not be obtained by simple physical methods
6.A physical change is reversible	6.A chemical change is irreversible