what is physical change...
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A physical change is a change to the physicalas opposed to chemical,properties of a substance. They are usually reversible.
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The difference between a physical reaction and a chemical reaction is composition. In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition .
Signs of a physical change include:
1 . Expected color change.
2. Change in size or shape.
3. Change in state of matter.
4. Reversible.
5. No new substance formed!
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