Chemical Change - change results in new substances with new properties, Physical Change - change in which the substance is altered but the substance is NOT transformed into a new one., Reactant - the initial substances that takes part in and undergo change during a reaction, Product - substance(s) that are formed as the result of a chemical reaction, Chemical Reaction - process that leads to the chemical change of one set of chemical substances to another, Conservation of Mass - the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction,

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