Chemical reaction: simply a chemical change the process by which one or more substances are changed into one or more different substances

      Chemical equation: symbol that describe a chemical reaction and indicate identities and relative amounts of reactants and product.

      Coefficient: numeral used tin a chemical equation to indicate relative amounts of reactants or product.

  Coefficients indicating amounts to balance a chemical equation. Subscripts within a chemical formula cannot be changed.

      The mass, number, and types of atoms remain the same on both sides of a balanced equation

       Combustion: exothermic reaction that usually invoves oxygen to form the oxide of the elements in a reactant.

       Decomposition: chemical reaction in which a single compound is broken down to produce two or more simpler substances

      Single-displacement: chemical reaction in which one element replaces another element in a compound.

       Synthesis: the process of building compounds from elementary substances through one or more chemical reactions

      A chemical reaction involves rearrangement of atoms from the reactants into new substances, the product.

       The only way to tell that a chemical reaction has occurred is to demonstrate that the new substances produced has different properties from the reactants

       An exothermic reaction release energy to the environment because the bonds holding the products together are stronger than the bonds holding the reactants together.

    Polymerization reactions are synthesis reactions that build large molecules from many repeated units