Assume that h and s are independent of temperature

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Unformatted text preview: n of ΔS° is positive. One point is earned for the correct sign and a correct explanation. (b) One of the diagrams below best represents the relationship between ΔG° and temperature for the reaction given in part (a). Assume that ΔH° and ΔS° are independent of temperature. Draw a circle around the correct graph. Explain why you chose that graph in terms of the relationship ΔG° = ΔH° – TΔS° . The leftmost graph should be circled. ΔS° is positive, so as T increases, TΔS° becomes a larger positive number. At higher temperatures, you are subtracting larger positive numbers from ΔH° to get ΔG°, so ΔG° decreases with increasing temperature. One point is earned for the correct graph selection. One point is earned for the explanation. © 2008 The College Board. All rights reserved. Visit the College Board on the Web: www.collegeboard.com. AP® CHEMISTRY 2008 SCORING GUIDELINES (Form B) Question 6 (continued) (c) A reaction mixture of N2O4 and NO2 is at equilibrium. Heat is added to the mixture while the mixture is maintained at constant pressure. (i) Explai...
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This note was uploaded on 05/05/2011 for the course CHEM 504 taught by Professor John during the Fall '11 term at American College of Computer & Information Sciences.

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