what is physical and chemical change?
Physical change and chemical change are two types of changes that substances can undergo.
| Basis | Physical Change | Chemical Change |
|---|---|---|
| Definition | A change in shape, size, or state without forming a new substance. | A change that results in the formation of one or more new substances. |
| New Substance | Not formed | Formed |
| Reversibility | Usually reversible | Usually irreversible |
| Properties | Chemical composition remains unchanged | Chemical composition changes |
| Examples | Melting of ice, cutting paper, boiling water | Rusting of iron, burning wood, digestion of food |
In simple terms: A physical change affects only the appearance or state of a substance, while a chemical change creates a completely new substance with different properties.