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Law of Conservation of energy 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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Chemical Changes occur when a substance combines with another to form a new substance. Also,  these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.

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Physical Change are changes affecting the form of a chemical substance, but not its chemical composition. Also, they are used to separate mixtures into their component compounds.

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Vaporization of an element or compound is a phase transition from the liquid phase to vapor. Also, evaporation is a surface phenomenon, whereas boiling is a bulk phenomenon.

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

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Kinetic Energy is energy that a body possesses by virtue of being in motion. Also, it is the energy of motion, observable as the movement of an object, particle, or set of particles.

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Energy is the strength and vitality  required for sustained physical or mental activity. Also, it is the power derived from the utilization of physical or chemical resources.