Question 1 What is a physical change. Give example?
Question 2 What is a chemical change. Give example ?
Question 3 Give the main differences between physical and chemical change?
Physical and Chemical Changes
Physical Changes
The changes in which no new substance are formed are called physical changes.
In a physical change, the substances involved do not change their identity. They can be easily returned to their original form by some physical changes.
For Example : Freezing of water, Boiling of water, Condensation of steam, Making a solution, Glowing of electric bulb, stretching of rubber band, cutting or tearing a piece of paper etc.
Chemical Changes
The changes in which new substance are formed, are called chemical changes.
In a chemical change, the substances involved change their identity i.e. they get converted into entirely new substance.
For Example : Burning of magnesium ribbon, Rusting of iron, Formation of curd from milk, Cooking of food etc.
| Physical change | Chemical Change |
| (1) No new substance is formed in the physical change. | A new substance is formed in a chemical change. |
| (2) Physical change is temporary change. | A chemical change is a permanent change. |
| (3) Physical change is reversible. | Chemical change is irreversible. |
| (4) Very little heat or light energy is usually absorbed or given out in a physical change | A lot of heat or light energy is absorbed or given out in a chemical change. |
| (5) The mass of a substance does not alter in a physical change | The mass of a substance does alter in a chemical change. |
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