Chem 4A - Spring 2006 - - Midterm 1

Chem 4A - Spring 2006 - - Midterm 1 - Name_ GSI _ Chemistry...

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Name__________________ GSI ____________________ 1 Chemistry 4B, Spring 2006 KEY February 13, 2006 (50 min., closed book) N a m e : G S I : S I D : S e c t i o n : Write your name and that of your GSI on all 7 pages of the exam. Equations, constants, and data are provided on the second page of the exam. 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 Thermodynamics 3 34 Equilibrium 4-5 32 Electrochemistry 6 18 Concepts 7 16 Total 100
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Name__________________ GSI ____________________ 2 k B = 1.381 × 10 -23 J/K m e- = 9.11 × 10 -31 kg h = 6.626 × 10 -34 J s c = 3.0 × 10 8 m/s 1 kJ = 1000 J J = (kg m 2 )/s 2 PV = nRT MM = mRT / (PV) T(K) = T(C) + 273.15 R = 0.0821 L·atm / (mol·K) R = 8.314 J / (mol K) P a = X a P tot P = F/A E = q + w H ° = Σ n H ° f (products) - Σ n H ° f (reactants) H ° = Σ n H ° bonds broken - Σ n H ° bonds formed G ° = Σ n G ° f (products) - Σ n G ° f (reactants) S ° = Σ nS ° (products) - Σ nS ° (reactants) for a reversible phase change T H T q S rev = = G ° = H ° - T S ° G = G ° + RT ln Q G ° = -RT ln K q = mC T 101.3 J = 1 L atm anode cathode cell E E E o o o = G o =− nFE cell o Q nF RT E E ln = o K E RT nF ln = o F = 96,485C/mol e- N A = 6.022 × 10 23 1 cal = 4.18 J 1 amp = 1 C/sec 1 Watt = 1 J/sec
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Name__________________ GSI ____________________ 3 Thermodynamics 1) Consider the formation of nitric oxide (NO) gas molecules from the elements. N 2 (g) + O 2 (g) 2NO (g) H rxn ° = + 180.50 kJ a) Draw the Lewis structures for the reactants and products. (6 points) a. N 2 O 2 NO NN OO NO b) Given the bond energy data on the back of your periodic table and the data above, calculate the bond energy for the nitrogen-oxygen bond in NO.
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This test prep was uploaded on 04/20/2008 for the course CHEM 4a taught by Professor Gordon during the Spring '06 term at University of California, Berkeley.

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Chem 4A - Spring 2006 - - Midterm 1 - Name_ GSI _ Chemistry...

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