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the law of conservation of energy states that the total energy of an isolated system in a given frame of reference remains constant

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Chemical changes occur when a substance combines with another to form a new substance

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Physical changes are changes affecting the form of a chemical substance

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Vaporization of an element or compound is a phase transition from the liquid phase to vapor.

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the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.

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energy that a body possesses by virtue of being in motion.

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the strength and vitality required for sustained physical or mental activity.