Lect_7oct10f08

Lect_7oct10f08 - Outline 7 10-OCT-2008 1. Review Names,...

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1 Outline 7 10-OCT-2008 1. Review – Names, molecular mass, moles Examples 2. Molar Mass a. Mass % from Formula b. Formula from mass% c. Formula from Combustion Analysis
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2 1.Same group elements may have similar compounds. Ex: S & Se Group VIA; SO 4 -2 (sulfate ion) so SeO 4 -2 (selenate ion) Cl & Br Group VII; HClO 2 (aq) , chlorous acid so ClO 2 - (chlorite ion) HBrO 2 (aq), bromous acid so BrO 2 - (bromite ion) 2. Oxoanions – names relative BrO 2 - (bromite ion) so BrO - (hypobromite ion) BrO 3 - (bromate ion) so BrO 4 - (perbromate ion) SeO 4 - 2 (selenate ion) so SeO 3 - 2 (selenite ion)
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3 Previous ion patterns most important , but note these! 1. Non-metallic Cations (-onium implies positive) NH 4 + ammonium ion H 3 O + hydronium ion (associated with acids) 2. Non-monatomic Anions Ending in -ide OH - hydroxide ion (-ide implies negative) CN - cyanide ion O 2 2- peroxide ion 3. Organic Anion C 2 H 3 O 2 - , acetate ion 4. Metal containing oxoanions CrO 4 -2 chromate ion, Cr 2 O 7 -2 dichromate ion MnO 4 - permanganate ion (manganate is MnO 4 2- !?) (Bold face indicates relative importance.)
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4 Ex: classify (Ionic, Molecular, Acid) to help write formula or name. 1. iron (III) sulfate • 2. H 2 SO 3 3. hydroiodic acid • 4. Na 3 PO 4 5. sulfur trioxide • 6. NI 3 7. aluminum carbonate • 8. N 2 O 4
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5 (last class) Atomic World 1 molecule H 2 O 18 amu Our World = 6.02 * 10 23 * atomic world 1 mole H 2 O 18 g Means that 6.02 * 10 23 * amu = 1.00 g (because 18 amu* 6.02 * 10 23 = 18 g)
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Review: Mass & Moles (last class) Molar mass - mass of one mole of substance. molar mass (grams per mole or [g/mol]) - numerically equal to formula weight (mass) in atomic mass units (amu). Ex: N 2 O 3 so 2*14.0 + 3*16.0 = 76.0 means 76.0 amu/molecule & 76.0 g/mole One mole of any element (compound) weighs its atomic (formula) mass in grams . Ex:
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This note was uploaded on 02/18/2009 for the course CHEM 1A taught by Professor Okamura during the Fall '08 term at UC Riverside.

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Lect_7oct10f08 - Outline 7 10-OCT-2008 1. Review Names,...

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