Physical Change:
A physical change affects the form or appearance of a substance, but does not change its chemical composition.
The substance is the same before and after the change. These changes are usually reversible.
Examples: melting ice, breaking glass, dissolving sugar in water.
Chemical Change:
A chemical change results in the formation of a new substance with different properties. It involves a chemical reaction and often produces signs like color change, gas formation, heat, or light. These changes are usually not reversible by simple physical means.
Examples: rusting of iron, burning wood, baking a cake.