what do you mena by physical and chemical changes??
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Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.
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In a physical change the nature of the substance, the particles of which it is composed and the numbers of particles remain unchanged.
In a chemical change the properties of the new substances are different from the original, the particles are different and the number of particles can change.
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