Chemistry 3.0 / 5 based on 1 rating ? ChemistryInternational BaccalaureateAll boards Created by: Martha BrownCreated on: 03-11-12 00:39 Relative atomic mass (Ar) The weighted average/mean mass of isotopes of an element compared to C-12 = 12 1 of 7 Relative molecular mass (Mr) The mass of a molecule calculated by the addition of relative atomic masses of constituent atoms where C-12 = 12 2 of 7 Molecular formula A formula that shows the actual number of atoms of each element present in one molecule of a compound. 3 of 7 Empirical formula The chemical formula that shows relative number of atoms of each element in substance in smallest whole-number ratios 4 of 7 Structural formula A formula that shows the arrangement of atoms and all the bonds in one molecule of a compound. 5 of 7 Mass number (A) The total number of protons and neutrons in the nucleus of an atom 6 of 7 Rate of reaction The decrease in reactant concentration per unit time. 7 of 7
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