Question

what is the difference between chemical and physical change?
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Answer 1

Answer:

Explanation:

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

Answer 2

Answer:

• Physical change

1. When the physical state of the substance changes but it's chemical composition remain same, then it is said that a physical change has taken.
2. Physical change is often temporary in nature.
3. During physical change, new substances are not formed.
4. Example: Condensation of steam, Evaporation of water, melting of ice, melting of wax.

• Chemical change

1. A chemical reaction is a process in which substances undergo bond breaking and are transformed into new substances by formation of new bonds.
2. Chemical changes remain permanent.
3. During chemical change, composition of matter changes.
4. Example: Burning of wood, Rusting of iron, Ripening of fruit.