Exam 4 Key 2005

Exam 4 Key 2005 - Prof. Gordie Miller Prof. Martha Russell...

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CHEMISTRY 155 Exam IV Prof. Gordie Miller Prof. Martha Russell FALL 2005 This EXAM consists of 5 PARTS on 6 PAGES CHEM 155 HOUR EXAM IV NAME_____KEY ____________ RECIT. INSTR._______________ RECIT. SECT.________________ GRADING Teaching Assistants and Recitation Sections PARTS I. II. III. IV. V. TOTAL POINTS 20 pts 20 pts 20 pts 20 pts 20 pts 100 pts SCORE ________ ________ ________ ________ ________ ________ Name Ben Baird Sayantan Bose Zach Breitbach David Dixson Ben Prince Aniket Thite Sections 3, 5, 7 8, 9, 15 6, 10 4, 12, 13 1, 14 2, 11 Time 10, 12 10 , 1 10 9, 10, 2 10 12 10 , 11 11, 1 10 , 3 10 8, 2 10 9, 12 10 Rules for the Exam: 1. Show all work. No credit will be given to PARTS III and V if no work is shown. 2. Work independently. 3. Useful information is on Page 7 (last page). You may tear this page off and use it for scratch paper. THE ANSWER KEY TO THIS EXAM WILL BE POSTED ON BULLETIN BOARD #2 IN THE HALLWAY EAST OF ROOM 1002 GILMAN AND ON THE CHEM 155 WEBSITE. CHEM 155 FINAL EXAM MONDAY, DECEMBER 12 4:30 – 6:30 P.M. SAME ROOMS AS HOUR EXAMS – NO CHANGE
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CHEMISTRY 155 Exam IV 2 PART I. (20 Points): Short Answer Questions. CIRCLE your answer. (1) (4 pts) A glass containing 200.0 g of H 2 O at 20.0 ° C was placed in a refrigerator. The water loses 11.7 kJ as it cools to a constant temperature. What is its new temperature ? The specific heat of water is 4.184 J/g ⋅° C. A. 4 ° C C . 1 4 ° C B. 6 ° C D . 3 4 ° C (2) (4 pts) The specific heat of gold ( 79 Au) is 0.129 J/g ⋅° C. What is the molar heat capacity of gold? A. 0.129 J/mol ⋅° C C. 39.0 J/mol ⋅° C B. 25.4 J/mol ⋅° C D. 197 J/mol ⋅° C (3) (4 pts) Which of the following reactions has its enthalpy change equal to the standard heat of formation of one mole of nitric acid ? A. H(g) + N(g) + 3 O(g) ⎯→ HNO 3 (l) C. 1/2 H 2 (g) + 1/2 N 2 (g) + 3/2 O 2 (g) ⎯→ HNO 3 (l) B. 1/2 H 2 (g) + 1/2 N 2 (g) + O 3 (g) ⎯→ HNO 3 (l) D. 1/2 H 2 O(l) + 1/2 N 2 O 5 (g) ⎯→ HNO 3 (l) (4) (4 points) Given H 2 (g) + 1/2 O 2 (g) ⎯→ H 2 O(l), H 0 = 286 kJ, determine the standard enthalpy change for the reaction 2 H 2 O(l) ⎯→ 2 H 2 (g) + O 2 (g).
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Exam 4 Key 2005 - Prof. Gordie Miller Prof. Martha Russell...

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