• A chemical reaction is a process that changes some chemical substances into others.
  • During a chemical reaction, the reactants are used up to create the products.
  • A chemical reaction can be represented by a chemical equation.
  • The conservation of matter is reflected in a reaction’s chemical equation and can be seen by looking for the same number of atoms of each element on each side of the arrow.
  • The number 2 in front of O2 and H2O shows that two oxygen molecules and two water molecules are involved in the reaction.
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