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chemistry CH 2-3

define

TermDefinition
molecule a combination of at least two atoms held together by chemical forces
law of constant composition different samples of a given compound always contain the same elements in the same ratio
diatomic molecules contain two atoms and may be heteronuclear or homonuclear
polyatomic molcules contain more than two atoms
molecular formula shows the exact number of atoms of each element in a molecule
structural formula shows not only the element composition, but also the general arrangements
empirical formulas the lowest whole number ratio of elements
molecular mass is the mass in atomic mass units (amu) of an individual molecule
molecular weight a.k.a. molecular mass
mole the amount of a substance that contains as many elementary entities as there are atoms in exactly 12 g of carbon-12
1 mole 6.022x10^23
molar mass the mass in grams of one mole of the substance
Created by: JAC1663
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