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chemistry CH 2-3
define
Term | Definition |
---|---|
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 |