what are the differences between chemical and physical changes
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There are several differences between a physical and chemical change in matter or substances. A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.
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A physical propertyis an aspect of matter that can be observed or measured without changing it. Examples ofphysical properties include color, molecular weight and volume. Achemical property may only be observed by changing the chemical identity of a substance.
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