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'''Physical Change''' #occurs when one or more physical properties of a substance are changed but without any change in the substance's chemical properties or composition #no new substance is formed #all changes of phase are physical changes (from solid to liquid to gas) '''Chemical Change''' #is any change that results in the production of one or more substances that differ in chemical properties and composition from the original substances #examples are the rusting of iron, the souring of milk, the burning of paper '''Changes in Energy''' #every change, either physical or chemical, involves an energy change #generally the energy changes that accompany physical changes are not as noticeable as those that accompany chemical changes #energy can be ''released'' (exothermic) or ''consumed'' (endothermic) during the reaction
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