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States that the total energy of an isolated system in a given frame of reference remains constant- it is said to be conserved over time.

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Changes occur when a substance combines with another to form a new substance, called chemical synthesis, or alternatively, chemical decomposition into two or more different substances.

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Changes affecting the form of a chemical substance, but not its chemical composition.

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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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power derived from the utilization of physical or chemical resources, especially to provide light and heat or to work machines.