Lecture5 - Molecules and reactivity Chem 1A Lecture 5: From...

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Unformatted text preview: Molecules and reactivity Chem 1A Lecture 5: From atom to molecule Ionic and covalent bonds Ionic bonds Na Cl +- Covalent bonds Naming Compounds: Binary Ions Compound Ions Name NaCl Na + , Cl- Sodium Chloride CsBr Cs + , Br- Cesium Bromide Type I: Cation (metal) has always the same charge (Na + , Ca 2+ ) Type II: Cation (metal) exists in different charge forms (Fe 3+ , Fe 2+ ) Binary Ions naming Type I binary ions 1. Cation first, anion second. 2. Monoatomic cation takes name of element. 3. Monoatomic anion takes root name of element plus the suffix ide CsF cesium fluoride AlCl 3 aluminum chloride CaS MgO calcium sulfide magnesium oxide Binary Ions naming Type II binary ions Cation (metal) is supplemented with a Roman numeral indicating the charge of the ion Binary Ions CuCl copper(I) chloride Fe 2 O 3 iron(III) oxide HgO mercury (II) oxide PbCl 2 lead (II) chloride Naming Compounds: Polyatomic Ions Naming Compounds: Binary Covalent a compound composed of two nonmetals NO nitrogen monoxide SO 2 sulfur dioxide 1. First element named first 2. Second element named as if anion 3. Prefixes denote number of atoms (mono-, di-, tri-) 4. Prefix mono- is never used for first element PCl 3 phosphorus trichloride N 2 O dinitrogen monoxide Naming Compounds: Acids a substance dissolved in water in which the cation is the hydrogen ion H + HCl hydrochloric acid H 2 SO 4 sulfuric acid 1. Prefix hydro- is added to anion name....
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Lecture5 - Molecules and reactivity Chem 1A Lecture 5: From...

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