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Reactant
A substance that takes part in and undergoes change during a chemical reaction.
Product
A substance formed because of a chemical reaction.
Mole
The SI unit of amount of substance
 Mole ratio
The ratio of the amounts of substances in a chemical reaction
Chemical reaction
The process in which one or more substances are converted into different substances
Decomposition
The breakdown of a compound into simpler substances
Single replacement/displacement
A chemical reaction in which one element replaces another in a compound
Double replacement/displacement
A chemical reaction in which the positive and negative ions of two ionic compounds exchange places
Combustion
A chemical reaction in which a substance reacts with oxygen to produce heat and light
Subscripts
Numbers written to the right and slightly below a chemical symbol, indicating the number of atoms of an element in a compound
Coefficients
Numbers placed in front of chemical formulas in a balanced chemical equation to indicate the relative amounts of reactants and products
Catalyst
A substance that increases the rate of a chemical reaction without undergoing permanent change itself
Law of Conservation of Matter
Matter cannot be created or destroyed in a chemical reaction
Balanced equation
A chemical equation in which the number of each type of atom is the same on both sides of the equation
Group
A column of elements in the periodic table with similar chemical properties
Period
A row of elements in the periodic table
Stoichiometry
The calculation of quantities in chemical reactions based on the balanced equation.
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