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Review and Problems

# Review and Problems - ExamDetails Date Wed Time...

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Exam Details Date: Wed Dec 17, 2008 Time: 9.00am-11.30am Rooms : PAC (Divisions 1-9) DC1350-1351 (Divisions 10 & 11) Details: 15 multiple choice questions cheat sheet (1- 8½” x 11”), both sides calculator

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Help Sessions Mary’s help session: Wed Dec 3 10.30am-noon DWE3522 Tues Dec 16 10am-12, 2-4pm WEEF lab If you would like to meet with me at a time other than these, please email me: [email protected]
Colligative properties Sec 13.7-13.8 Vapour pressure lowering when a solid with negligible vapour pressure is dissolved in a liquid, the effect on the vapour pressure of the solution P 1 = x 1 P vap, 1 P vap, 1 = – x 2 P vap ,1 Estimating molar mass Boiling point elevation 1 , 1 1 2 2 2 2 1 , 1 2 2 1 / / / vap vap P M m M m M m P n n n P + - = + - = = = ) / 1000 /( / 1 2 2 kg g m M m iK m iK T b b b

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Colligative properties Freezing point depression Δ T f = – iK f m Electrolytes: i is the number of particles released into solution per formula unit of solute. minimum value: i = 1 (no dissociation) maximum value: i = number of particles generated by complete dissociation of a formula unit of solute NaCl: i = 2 is the maximum value Osmotic pressure RT V n cRT g h 2 = = = ρ π
Chemical Equilibrium 15.1-15.7 – Chemical Equilibrium 18.1-18.5 – Solubility and Complex-Ion Equilibrium For the general reversible chemical reaction: a A + b B c C + d D The equilibrium constant is defined by the equation: Concentrations of pure solids and liquids are not included in the definition of the equilibrium constants K c and K p because these concentrations are constant b a d c c B A D C K ] [ ] [ ] [ ] [ = d c b a c p d c b a p c RT K K RT K K + + - - - - + = = ) ( ) (

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07 - Chemical Equilibrium 6 Chemical Equilibrium If a reaction is multiplied by a constant, K c must be raised to a power equal to that constant K c for a reaction and its reverse are reciprocals of each other When two reactions or more are added, multiply their K c values to obtain the K c for the overall reaction. = = 2 2 ] [ ] [ : 2 2 ] [ ] [ : A B K B A A B K B A c c = = ] [ ] [ : ] [ ] [ : B A K A B A B K B A c c = = = = 2 1 3 2 1 ] [ ] [ : ] [ ] [ : ] [ ] [ : c c c c c K K A C K C A B C K C B A B K B A
07 - Chemical Equilibrium 7 Chemical Equilibrium General reversible chemical reaction ( NOT at equilibrium ): a A + b B c C + d D with initial concentrations [A] init , [B] init , [C] init , [D] init Reaction quotients for this reaction are defined as: Q c and Q p are analogous to K c and K p BUT Q c and Q p are calculated for non-equilibrium concentrations b init B a init A d init D c init C p b init a init d init c init c P P P P Q B A D C Q = = ; ] [ ] [ ] [ ] [

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Review and Problems - ExamDetails Date Wed Time...

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