exam 2 3-2-07 - Chemistry 1B Mid Term Exam 2 VERSION A...

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Chemistry 1B, Mid Term Exam 2, VERSION A March 2, 2007 Professor Watts Instructions: Your exam booklet should contain 25 multiple choice questions on 7 numbered pages. Check your booklet to be sure that it includes all 25 questions and 7 numbered pages. If not, return it to a proctor for a replacement. The 25 multiple choice questions are each worth 4 points credit for a correct answer. Questions must be answered on the scan tron exam sheet that is provided with the exam. Fill out the bubbles for the first 25 questions on the answer sheet. Be sure to mark your perm number in the bubbles on the sheet and to print your name and perm number on the scan tron . The version of your exam must be marked on the scan tron answer sheet to assure that it is graded correctly. The exam version of this booklet is VERSION A. When you have completed your exam, turn in only the scan tron answer sheet. Keep the exam booklet with questions for your own records. Information sheets with formulas, values of constants, and standard half cell potentials are included in your test booklet YOUR EXAM IS VERSION A Mark “A” on the scan tron in the section called “test form”
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Formulas and Constants, Mid-term Exam 2, 3-2-07 Coulombs 500 , 96 F K / J 10 x 38 . 1 k J 184 . 4 cal 1 J 101 atm L 1 mol K atm L 0821 . 0 R mol K J 31 . 8 R 23 B = = = = = = ( ) S Δ T H Δ G Δ ln k S Δ V V ln nR S Δ T q S Δ T Δ nC H Δ T Δ nC E Δ V Δ P w T Δ nC q T Δ nC q T Δ nC q V Δ P E Δ H Δ PV Δ E Δ H Δ w q E Δ B i f rev P V ext P P V V = = = = = = = = = = + = + = + = G = G o + RT lnQ G o = -RT lnKeq G = -nFE E = E o –(RT/nF) lnQ E = E o – (0.059/n) logQ E o =( 0.059/n) log Keq [ ] [ ] inside outside mem x x log mV Z 62 ) x ( E × = E 0 cell = E 0 1/2 (cathode) – E 0 1/2 (anode) [A] = [A] o – k t [A] = [A] o e – k t or ln [A] = ln [A] o – k t kt A 1 A 1 0 =
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Mid-Term Exam 2, 3-2-07 VERSION A 1. The plot below shows the concentration versus time for the following reaction 2NO 2 (g) 2 NO(g) + O 2 (g) The instantaneous initial rate of this reaction has a value of a) 2.4 × 10 -5 M/s b) 8.6 × 10 -6 M/s c) less than 8.6 × 10 -6 M/s d) 1.2 × 10 -5 M/s e) greater than 1.2 × 10 -5 M/s
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