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Unit 1: Chapter 2: Atoms, Molecules, and Ions
For the test on September 8, 2010
13
Chemistry
11th Grade
09/07/2010

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Term
Law of Definite Proportions
Definition
(Law of constant composition) a pure compound, whatever its source, always contains definite or constant proportions of the elements by mass.
Term
Law of Multiple Proportions
Definition
when two elements form more than one compound, the masses of one element in these compounds for a fixed mass of the other element are in ratios of small whole numbers.
Term
Nuclide
Definition
a particular atom characterized by a definite atomic number and mass number.
Term
Franctional Abundance
Definition
the fraction of the total number of atoms that is composed of a particular isotope.
Term
Formula Unit
Definition
the group of atoms or ions explicitly symbolized in the formula.
Term
Monoatomic Ion
Definition
an ion formed from a single atom.
Term
Binary Compound
Definition
a compound composed of only two elements.
Term
Molecule
Definition
a definite group of atoms that are chemically bonded together-- that is, tightly connected by attractive forces.
Term
Hydrate
Definition
a compound that contains water molecules weakly bound in its crystals.
Term
Formula Mass
Definition
(Formula Weight, FW) the sum of the atomic weights of all atoms in a formula unit of a compound.
Term
Molar Mass
Definition
the mass of one mole of substnace. In grams, it is numerically equal to the formula weight in atomic mass units.
Term
Molecular Weight
Definition
(MW) the sum of the atomic weights of all the atoms in a molecule.
Term
Atomic Mass Units
Definition
(amu) a mass unit equal to exactly one-twelfth the mass of a carbon-12 atom.
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