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Description
Chemical substances exist as solids, liquids, gasses, or plasma and may change between these phases of matter with changes in temperature or pressure. Chemical reactions convert one chemical substance into another.
Forms of energy, such as light and heat, are not considered to be matter, and thus they are not "substances" in this regard.
Forms of energy, such as light and heat, are not considered to be matter, and thus they are not "substances" in this regard.
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Chemicals
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