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# HW14 - HW14...

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HW14 (Homework) BARAKAT FARRIS CH101, section 003, Fall 2008 Instructor: Lori Petrovich Web Assign Current Score: 5 out of 5 Due: Wednesday, October 22, 2008 11:59 PM EDT Description REMINDER: EXAM 3 IS MONDAY, OCTOBER 27, 2008. Title: First Law and Second Law Chapter 9 Reaction Energetics Sections 9.1-9.7 Table of Bond Energies Chapter 9 Study Sheet Instructions The question submission scoring is as follows: Correct on first submission: full points Correct on second submission: full points Correct on third submission: full points Correct on fourth submission: 90% of points Correct on fifth submission: 80% of points Do NOT press 'submit all questions" when you are finished. This will do exactly as indicated, and submit all questions, reducing your score. The due date for this assignment is past. Your work can be viewed below, but no changes can be made. Extensions are no longer available for this assignment. (Automatic Extensions are only available within 2 days of the assignment due date.) View Key 1. 0.5/0.5 points | 1/5 submissions For some system: 130 J of work are done on a system and while it gives off 265 J of heat. What are E, E sur and E univ ? HW14 http://www.webassign.net/[email protected]/student.pl?f=20... 1 of 7 12/14/08 3:08 AM

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E system : -135 J E sur : 135 J E univ : 0 J 2. 0.5/0.5 points | 1/5 submissions Use the Table of Bond Energies or Table 9.2 on page 189 of your textbook to estimate the enthalpy change in each of the following reactions: (Be sure to draw the correct Lewis Structures for products and reactants.) Reaction H (kJ) H 2 CBr 2 (g) + F 2 (g) H 2 CF 2 (g) + Br 2 (g) -452 ICH 3 (g) + H 2 O(g) H 3 COH(g) + HI(g) 40 HC CH(g) + 2H 2 (g) H 3 C-CH 3 (g) -307 CH 4 (g) C(g) + 2H 2 (g) 780 3. 0.5/0.5 points | 1/5 submissions No Marks. To determine what portion of the question you have correct, click on question score at the top of the assignment. Be sure to refresh question score after each
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