Chemical Change - A process where one or more substances are altered into one or more new and different substances. , Physical Change - A type of change in which the substance is altered but the substance is NOT transformed into a new one., Reactant - A substance that takes part in and undergoes change during a reaction., Product - A substance that is formed as the result of a chemical reaction., Chemical Reaction - Chemical change that occurs when substances are combined., Conservation of Mass - A principle stating that mass can be neither created nor destroyed., Catalyst - A chemical that makes a chemical reaction happen faster.,

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