- Some changes can be reversed and some cannot be reversed.
- A change may occur by heating a substance or by mixing it with some other.
- A reversible change is a change that can be undone or reversed. Melting is an example of a reversible change.
- An irreversible change is a permanent change that cannot be undone. In an irreversible change, new substances are formed.
- Heating a substance can cause an irreversible change.
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