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Physical changes are those in which the shape, size, or state of the matter changes, but the substance is still essentially the same. For example, chopping up a carrot or ice melting into water are both physical changes.
Examples:
- cutting a log into smaller pieces. - wearing away of rock by wind-blown sand. - braiding hair. - crushing a metal can. - melting chocolate
Chemical changes are those where one or more substances are combined to produce a new substance. Example: Burning a piece of paper, or baking a cake.
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