ap07_chemistry_form_b_sgs_final_complete

Iii determine the value of the standard potential e of

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Unformatted text preview: on that takes place at the cathode, and O2 + 4 H+ + 4 e− → 2 H2O One point is earned for either the equation of the correct half reaction, or for indicating “the reduction half reaction” if the correct equation is given in (b)(i) . (iii) determine the value of the standard potential, E°, of the cell. E° = 1.23V + 0.00 V = 1.23 V One point is earned for the standard potential. © 2007 The College Board. All rights reserved. Visit apcentral.collegeboard.com (for AP professionals) and www.collegeboard.com/apstudents (for students and parents). AP® CHEMISTRY 2007 SCORING GUIDELINES (Form B) Question 3 (continued) (c) Calculate the charge, in coulombs, that passes through the cell during the 78.0 minutes of operation as described in part (a). − (0.0746 mol O2 ) × 4 mol e 96, 500 C × = 2.88 × 104 C 1 mol O2 1 mol e− One point is earned for the stoichiometry. One point is earned for the answer. © 2007 The College Board. All rights reserved. Visit apcentral.collegeboard.com (for AP professionals) and www.collegeboard.com/...
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This note was uploaded on 10/01/2009 for the course OC 9876 taught by Professor Dq during the Spring '09 term at UC Merced.

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