Key Terms

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

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