Chapter 21 Vocabulary Study Set

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chemical equation
a way to describe a chemical reaction using chemical formulas and other symbols
chemical formula
A combination of chemical symbols and numbers to represent a substance.
subscript
represents the number of atoms of an element
coefficient
large number in from of a compound that represents the number of molecules
reactants
Starting materials in a reaction
products
Ending materials in a chemical reaction.
synthesis reaction
A reaction in which two or more substances combine to form a new compound: A + B = AB
decomposition reaction
A reaction in which a single compound breaks down to form two or more simpler substances: AB= A + B
single replacement reaction
AB+C----->AC+B
double replacement reaction
AB + CD = AD + BC
law of conservation of mass
Mass is neither created nor destroyed in chemical reaction: what goes in must come out
yield sign
the arrow in the middle of a chemical equation that separates reactants and products
inhibitor
A substance that slows down or stops a chemical reaction
catalyst
A substance that speeds up the rate of a chemical reaction.
endothermic reaction
A reaction in which energy is absorbed
exothermic reaction
A reaction that releases energy in the form of heat or light.
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