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17 Cards in this Set

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stoichiometry
the quantitive derivation of information from chemical symbols, formulas, and equations
amu
atomic mass unit -- 1/12 of the mass of a carbon-12 atom
Avogadro's number
the number of atoms in 12.00g of carbon-12 (6.02 x 10^23)
mole
an Avogadro's number of particles
molecular weight (mass)
the sum of the atomic weights of the atoms in the chemical formula
molarity
the number of moles of solute dissolved in one liter of solution (mol/L or M)
STP
Standard Temperature and Pressure - 0 C -- 273K -- 1 atm (atmosphere) -- 14.7 (pounds/in^2) -- 29.92 in Hg
empirical formula
the simplest whole number ratio of different atoms that make up a compound
molecular formula
the actual number of atoms of each element in a compound
crystal
a solid that possesses an orderly, internal, repeating pattern of the atoms, ions, or molecules that make it up
amorphous solid
a solid in which the molecules that make it up are arranged in a random fashion
hydrate
a crystalline form of a compound which has H2O molecules incorporated in its structure
anhydrous
a compound that is left after all the H2O is driven off
hygroscopic
substances that absorb moisture from the air to form a hydrate
efflorescent
substances that are hydrates which tend to loose their H2O to the air
deliquescent
substances that absorb so much moisture from the air that they dissolve in the H2O forming a solution
deliquescent
substances that absorb so much moisture from the air that they dissolve in the H2O forming a solution