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Physical Science-21

Chapter 21 Vocabulary Words

QuestionAnswer
Chemical Reaction A change in which one or more substances are converted into new substances.
Reactant The substances that react.
Product The new substances that are produced.
Chemical Equation A way to describe a chemical reaction using formulas and other symbols.
Coefficient The numbers in a chemical equation that represents the number of units of each substance taking part in a chemical reaction.
Subscript In a chemical formula, a number below and to the right of a symbol indicating number of atoms.
Balanced Chemical Equation This has the same number of atoms of each element on both sides of the equation.
Combustion Reaction Occurs when a substance reacts with oxygen to produce energy in the form of heat and light.
Synthesis Reaction Two or more substances combine to form another substance.
Decomposition Reaction Occurs when one substance breaks down into two or more substances.
Single-displacement Reaction When one element replaces another element in a compound.
Double-displacement Reaction When the positive ion of one compound replaces the positive ion of the other to form two new compounds.
Precipitate An insoluble compound that comes out of solution during a double-displacement reaction.
Oxidation The term to describe the loss of electrons in a reaction.
Reduction The term to describe the gain of electrons in a reaction.
Chemical Bond The force that holds two atoms together.
Exergonic Reaction Chemical reactions that release energy.
Exothermic Reaction Energy given off in a reaction in the form of heat.
Endergonic Reaction Chemical reaction that requires energy to begin.
Endothermic Reaction Chemical reaction that requires heat energy to begin.
Catalyst A substance that speeds up a chemical reation without being permanently changed itself.
Inhibitor A substance that slows down a chemical reaction.
Created by: mrscummings
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