Chem MT3 2008 - Name_GSI_ Chemistry 1A, Fall 2008 Midterm...

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Name_______________GSI________ Page 1 of 9 Chemistry 1A, Fall 2008 Midterm Exam III-Version A November 12, 2008 (90 min, closed book) Name: TA: SID: Section: Please read this first: Write your name and that of your TA on all 9 pages of the exam Test-taking Strategy In order to maximize your score on the exam: Do the questions you know how to do first. Go back and spend more time on the questions you find more challenging. Budget your time carefully -- don't spend too much time on one problem. Show all work for which you want credit and don't forget to include units. Question Page Points Score A 2 10 Bi-ii 3 10 Biii-vii 4 17 C,D 5 21 E 6 14 F (MC) 7-9 28 Total 100 Useful Equations and constants: Δ G ° = Δ H ° - T Δ S ° Δ H ° = Σ n Δ H ° f (products) - Σ n Δ H ° f (reactants) Δ S ° = Σ nS ° (products) - Σ nS ° (reactants) Δ G ° = Σ n Δ G ° f (products) - Σ n Δ G ° f (reactants) PV=nRT 1L·atm = 0.1kJ w = - P ext Δ V Δ G ° = - RTln K Δ G = Δ G ° + RTln Q Δ G ° = - nF Δ u º Δ u = Δ u º - (RT/nF) lnQ or Δ u = Δ u º - (0.05916V/n) logQ oxidation occurs at the anode reduction occurs at the cathode Δ E cell = E cathode -E anode R S T R H K ° Δ + ° Δ - = 1 ln N 0 = 6.02214 x 10 23 mol -1 T (K) = T (C) + 273.15 F = 96,485 C / mol 1 V = 1 J / C R = 8.31451 J K -1 mol -1 R = 8.20578 x 10 -2 L atm K -1 mol
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Page 2 of 9 A.) Bond Energy and Potential Energy The following figure is a plot of the potential energy as a function of separation (r) between atoms. The black line corresponds to a hydrogen atom (H · ) and a chlorine atom (Cl · ) approaching each other. H · (g) + Cl · (g) HCl (g) Potential Energy + 0 - i. Which curve would correspond to hydrogen and fluorine (H · + F · ) atoms? Curve A same as H+Cl Curve B ii. Explain your choice in terms of the separation distance. iii.
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Chem MT3 2008 - Name_GSI_ Chemistry 1A, Fall 2008 Midterm...

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