Examples of physical changes would include freezing water, cutting paper, and mixing water with acetone.
Physical changes are changes that alter the physical form of substances but not their chemical form. Physical changes are often reversible.
On the other hand, chemical changes are changes that alter the chemical form of substances, with or without a change in their physical forms. Chemical changes result in the formation of new products.
Freezing of water is a reversible process as the water can be retrieved by thawing the ice formed. Cutting of paper does nothing to the chemical composition of the paper and acetone/water mixture can be separated by fractional distillation. Hence, the 3 processes are physical changes.
The burning of wood is a chemical change because the chemical composition of the wood is altered and new products are formed. Rusting of iron also leads to the formation of new products,
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