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#Chem 161-2007 recitation 5th week

#Chem 161-2007 recitation 5th week - CHEMISTRY 161-2007 5th...

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CHEMISTRY 161-2007 5 th WEEK RECITATION ANNOUNCEMENTS E-MAIL TTENDANCE EXAMS Pick up recitation quizzes after class. You are responsible for holding onto all old quizzes in  case of disagreement in final points. Chem 161-2007 recitation 5 th week
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PLAN FOR TODAY : PRECIPITATION REACTIONS OXIDATION-REDUCTION REACTIONS ACID-BASE REACTIONS • PRESSURE GAS LAWS Chem 161-2007 recitation 5 th week
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ET note: Not everything goes through moles, e.g., volume to grams, grams to volume, atoms to molecules, molecules to atoms. ZUMDAHL 6 TH EDITION CHEM 161-2007 RECITATION 5th WEEK CHAPTER 5 - STOICHIOMETRY Chem 161-2007 recitation 5 th week A MOLE moles A moles B atoms molecules (or atoms if particle is an atom) M B or V B g B or MW B V B M A or V A V A g A or MW A MOLES ARE AT THE CENTER (FOR CONVERSIONS, WORK THROUGH MOLES) MW (D = g/V) (moles A = g A /MW A ) (moles = g /MW ) mol A = M A L A moles = PV/RT for gases (molecules x atoms/molecule = atoms) (moles A = g A /MW A ) mol B = M B L B (moles B = g B /MW B ) (D = g/V) (moles x Avog. No. = molecules (or atoms)) %A % B Empirical formula Molecular formula (MW/EW) x Emp form = molec form moles = g/MW PV = nRT moles = M x V P 1 V 1 /n 1 T 1 =P 2 V 2 /n 2 T 2 g/MW = M x V D = g/L
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PRECIPITATION REACTIONS (HEAVY METAL IONS FORMING PRECIPITATES) 1A 2A 3A 4A 5A 6A 7A 8A He Li + Be B C N O F Ne Na + Mg 3B 4B 5B 6B 7B 8B 8B 8B 1B 2B Al Si P S Cl - Ar K + Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br - Kr Rb + Sr Y Zr Nb Mo Te Ru Rh Pd Ag + ? Cd In Sn Sb Te I - Xe Cs + Ba 2+ La Hf Ta W Re Os Ir Pt Au Hg 2 2+ Tl Pb 2+ Bi Po At - Rn Chem 161-2007 recitation 5 th week mostly solouble mostly insoluble NH 3
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PRECIPITATION REACTIONS Concept: Soluble salts: All group IA metal ions and NH 4 + All nitrates (NO 3 - ), acetates (CH 3 CO 2 - ), perchlorates (ClO 4 - ) All Cl - , Br - , I - * (except Ag + , Pb 2+ , Hg 2 2+ ) All SO 4 2- (except Pb 2+ , Hg 2 2+ , Ba 2+ , Sr 2+ , Ca 2+ ) (All IO 3 - and IO 4 - (except Pb 2+ , Hg 2 2+ , Ba 2+ )) *Note absence of F - Insoluble salts: Ag + , Pb 2+ , Hg 2 2+ , Ba 2+ Hydroxides (OH - ) Sulfides (S 2- ) Carbonates (CO 3 2- ) Phosphates (PO 4 3- ) (Chromates (CrO 4 2- )) Chem 161-2006 recitation 4 th & 5 th week combined 5 HIGH PRIORITY LOW PRIORITY
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ZUMDAHL 6th EDITION CHEM 161-2007 RECITATION 5 TH WEEK CHAPTER 4 - TYPES OF CHEMICAL REACTIONS AND SOLUTION STOICHIOMETRY PRECIPITATION REACTIONS ET: Discuss molecular, ionic, net ionic reactions and spectator ions Chapter 4-35 Write molecular, ionic and net ionic equations for the reaction, if any, that occurs when aqueous solutions of the following are mixed.
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