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chemistry chapter 6
chemistry Mrs Jones
24
Science
8th Grade
11/24/2008

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Term
synthesis
Definition
when 2 or more substances combine to make more complex compounds
Term
coevalant bond
Definition
a chemical bond formed when 2 or more atoms share electrons between nonmetals and nonmetals
Term
ionic bond
Definition
attraction between 2 oppositely charged ions its between a metal and a nonmetal
Term
ion
Definition
a atom or group of atoms that becomes electrically charged
Term
polytomic ions
Definition
ions made up of more the none ion
Term
molecular compound
Definition
compound composed of molecules
Term
polar bond
Definition
a coevalant bond where the electrons were shared unequally
Term
non-polar bond
Definition
bond where the electrons are shared equally
Term
nucleation
Definition
dissolved molecules that form clusters
Term
crystal
Definition
nuclei growth and form crystals
Term
what are the four crystal structures
Definition
molecular crystals, covalant crystals, ionic crystals, and metallic crystals
Term
what does an up arrow mean
Definition
a gas is formig
Term
what does a down arrow mean
Definition
a solid is forming
Term
precipitate
Definition
solid that froms from a solution during a chemical reaction
Term
endothermic reaction
Definition
results in a net absorption of energy *cold*
Term
exothermic reaction
Definition
results in a net release of energy *warm*
Term
activation energy
Definition
the minimum amount of energy needed to start a chemical reaction
Term
what are the 4 factors that affect the rate of reaction?
Definition
surface area, temperature, concentration, and catalysts.
Term
concentration
Definition
amount of a substance in a given volume
Term
catalysts
Definition
material that increases the rte of reaction by lowering the activation energy
Term
enzymes
Definition
the cells in your body hat contain biological catalysts
Term
inhibitor
Definition
material used to decrease the rate of reaction
Term
decomposition
Definition
when compounds break down to simpler compounds
Term
replacement reactions
Definition
one element replaces another in a compound
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