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UT Knoxville CHEM 120 - 01-22-14

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Atomic MassPeriodic TableChemical FormulasIonsMonatomic IonsIon NomenclatureIonic CompoundsBinary Molecule NomenclatureAcidsChapter 2 1Atomic MassThe atomic mass unit (amu) is defined as exactly one-twelfth the mass of a carbon-12 atom.Periodic TableChapter 2 2Chapter 2 3Chemical FormulasMolecular formulas give the exact number of atoms of each element in a molecule.Empirical formulas give the lowest whole-number ratio of atoms of each element in a compound.Chapter 2 4IonsWhen an atom or molecule loses or gains electrons, an ion is formed.A cation is positively-charged.An anion is negatively-charged.Monatomic IonsChapter 2 5Chapter 2 6Ion NomenclatureThe name of a monatomic cation is the same as the parent element.If it can have more than one possible charge, the charge is written after the name as a Roman numeral in parentheses.The name of a monatomic anio n uses the suffix -ide.Ionic CompoundsChapter 2 7Chapter 2 8Binary Molecule NomenclatureA prefix is used to denote the number of atoms of each element in the compound (mono- is never used on the first element).The ending on the second element listed is changed to -ide.Chapter 2 9AcidsTaste sour, if diluted with enough water to be tasted safely.May produce a pricking or stinging sensation on the skin.React with many metals to produce ionic compounds and hydrogen


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UT Knoxville CHEM 120 - 01-22-14

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