Question

Differentiate between physical change and chemical change .

Answer 1

1. A physical change is reversible, a chemical change is not. For example, the freezing of water would be a physical change because it can be reversed, whereas the burning of wood is a chemical change - you can't 'unburn' it

2. A physical change is a change in which no new substance is formed; a chemical change results in the formation of one or more new substances. Again, consider the previous examples: Freezing water into ice just results in water molecules which are 'stuck' together - it's still H2O. Whereas burning wood results in ash, carbon dioxide, etc, all new substances which weren't there when you started.

Answer 2

physical change-a change in which a substance retains its identity and changes in form or state without altering in composition
physical change is temporary easily reversible without no new substance formed and composition and properties of original substance not altered

chemical change-a change in which the substance loses its identity and produces one or more new substance by change in its composition
a chemical change is permanent not easily reversible without a new substance formed and composition and properties of original substance altered.
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