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Key Terms
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25
Chemistry
11th Grade
05/22/2013

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Term
Chemistry
Definition
the study of the composition of matter and the changes it undergoes
Term
Organic Chemistry
Definition
study of carbon compounds
Term
Biochemsitry
Definition
study of processes that take place in organisms
Term
Matter
Definition
anything that has mass and takes up space
Term
Heat
Definition
toatl kinetic energy
Term
Wavelength
Definition
measurement from the crest of one wave to the next
Term
Endothermic
Definition
energy is absorbed
Term
Exothermic
Definition
energy is released
Term
Valence Electrons
Definition
outer most electrons to be gained or lost in a chemical compound
Term
Cation
Definition
positively charged ion
Term
Anion
Definition
negatively charged ion
Term
Atomic Radius
Definition
half the distance between the nuclei of identical atoms that are bonded together
Term
Ionization Energy
Definition
the energy required  to remove one electron from a neutral atom
Term
Electronegativity
Definition
measure of ability of an atom in a chemical compound to attract electrons
Term
Formula Unit
Definition
lowest whole number ratio of ions
Term
Oxidation Number
Definition
charges atoms take on to obey the octet rule (group number)
Term
Avogadro's Number
Definition
6.02X10^23
Term
Empirical Formula
Definition
lowest ratio of a formula
Term
Synthesis Reaction
Definition
A + B = AB
Term
Decomposition Reaction
Definition
AB = A + B
Term
Single Replacement Reaction
Definition
A + BX = AX + B
Term
Double Replacement Reaction
Definition
AB + CD = AD + CB
Term
Combustion Reaction
Definition
X + X = CO2 + H2O
Term
Limiting Reactant
Definition
runs out first in a chemical reaction, reaction stops
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