lect_5oct8f09

lect_5oct8f09 - Outline 5 8-OCT-2009 1. Review ions formula...

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1 Outline 5 8-OCT-2009 1. Review ions formula names (ionic (acids)) formula names (molecular ) Skill: formula ↔ names 2. Molecular mass from formula Skill: formula unit or molecule ↔ mass 3. Moles – counting unit a. Mass % from Formula b. Formula from mass% c. Formula from Combustion Analysis
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2 Review: Formulas and Names (1) Go by Class of Compounds A. Ion Based - 1. Ions ↔ Formula (Charge Balance) Ex1: Al +3 and O -2 ; let x = subscript of Al +3 and y =subscript of O -2 Values of x & y must be such that net charge = 0 x Al +3 ions * (+3/ion)+ y O -2 ions *(-2/ion) = 0 so 3* x – 2 y= 0 so x/y = 2/3 Al 2 O 3 Verify 2*(+3) + 3*(-2) = 6 -6 = 0
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3 Review: Formulas and Names (2) Go by Class of Compounds A. Ion Based (cont.) - 1. Ions ↔ Formula (again) (Charge Balance) (cont.) Ex2: (NH 4 ) 2 CO 3 (go backwards) Using sum charges = 0 means 2*NH 4 charge + 1* CO 3 charge =0 Rearrange NH4 charge/ CO3 charge = - 1/2 NH 4 is first (cation) so (+) charge (+1 ) then CO 3 is anion (-) charge (-2).
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4 Review: Formulas and Names (3) Go by Class of Compounds (cont.) A.Ion Based (cont.) 2. Formula ↔ Name (a.) Binary: cation then anion, - ide Ex1: Al 2 O 3 Al +3 & O -2 ions aluminum oxide Ex2: calcium bromide Ca +2 & Br - CaBr 2
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5 Review: Formulas and Names (4) Go by Class of Compounds (cont.) A.Ion Based (cont.) 2. Formula ↔ Name (cont.) (b.) Polyatomics: cation then anion, -ate or – ite Ex1: (NH 4 ) 2 CO 3 NH 4 + 3 -2 ammonium carbonate Ex2: potassium phosphate K + PO 4 -3 K 3 PO 4
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6 Review: Formulas and Names (5) Go by Class of Compounds (cont.) A.Ion Based (cont.) 2. Formula ↔ Name (cont.) (c.) Acids - H and ion Binary : hydro – root - ic acid Ex1: HI I - hydro iod ic acid Ex2: hydrosulfuric acid S -2 H 2 S
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7 Review: Formulas and Names (6) Go by Class of Compounds (cont.) A.Ion Based (cont.) 2. Formula ↔ Name (cont.) (c) Acids (cont.) Oxoanions : root -ate ; root - ic acid root -ite ; root - ous acid Ex1: HClO 3 ClO 3 - , chlorate ion chlor ic acid Ex2: chlor ous acid ClO 2 - , chlorite ion HClO 2
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8 -ate (more) goes with –ic & -ite (less) goes with -ous
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9 Review: Formulas and Names (7) Go by Class of Compounds (cont.) A.Ion Based (cont.) 2. Formula ↔ Name (cont.) (c) hydrates prefixes for # of waters Ex1: MgSO 4 •7 H 2 O Mg +2 4 -2 magnesium sulfate heptahydrate Ex2: calcium sulfate dihydrate Ca +2 & SO 4 -2 CaSO 4 • 2H 2 O
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10 Review: Formulas and Names (8) Go by Class of Compounds (cont.) B. Molecule Based (Covalent)- 1. Binary - two nonmetals; numerical prefixes, - ide Ex1: Cl 2 O 5 dichlorine pentoxide Ex2: dinitrogen tetrahydride N 2 H 4 2. Organic - C&H & others; Ex: C 3 H 7 OH Hydrocarbons, - ane To be done today
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Review: Names Formulas (1) write name or formula. 1. lead (II) carbonate
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lect_5oct8f09 - Outline 5 8-OCT-2009 1. Review ions formula...

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