Editing revision 1 of Notes On Chemical And Physical Change
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<center><b>Notes on Chemical and Physical Change</b></center><br> <br> <b>Physical Change</b><br> #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) <b>Chemical Change</b><br> #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 <b>Changes in Energy</b><br> #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 <u>IMPORTANT</u>: Lavoisier's principle of the '''Law of Conservation of Mass''' states that "matter ''cannot'' be created or destroyed by a chemical change."
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