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Chapter 21

Balanced Chemical Equation The same number of atoms on both sides of the equation.
Catalyst A substance the speeds up a chemical reaction without completely changing itself.
Chemical Equation A way to describe a chemical reaction using chemical formulas and other symbols.
Chemical Reaction A change is which one or more substances are converted into new substances.
Coefficient Represent the number of units of each substance taking part in each substance.
Combustion Reaction Occurs when a substance reacts with oxygen.
Decomposition Reaction Occurs when one substance breaks down, decomposes, into two or more substances.
Double Displacement Reaction The positive ion of one compound replaces the positive ion of the other to form two new compounds.
Endergonic Reaction Sometimes a chemical reaction requires more energy to break bonds than is released when new ones are formed.
Endothermic Reaction When the energy needed is in the form of thermal energy.
Exergonic Reaction Less energy is needed to break the original bonds than is released when new bonds form.
Exothermic Reaction When the energy given off is primarily in the form of thermal energy.
Inhibitor Used to slow down chemical reactions.
Oxidation Describes the loss of electrons.
Precipitation An insoluble compound that comes out of solution during this type of reaction.
Product New substances produced.
Reactant New substances that react.
Reduction Describes the gain of electrons.
Single-displacement Reaction When one element replaces another element in a compound.
Synthesis Reaction Two or more substances combine to form a new substance.
Created by: Christopher H.