Midterm 1 - Key

# Midterm 1 - Key - Name Section and Time Instructor Meadows...

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Name____________________________________ Section and Time__________________________ Instructor: Meadows Winter 09 CHEMISTRY 124 Exam Ia Instructions: CLOSED BOOK EXAM ! No books, notes, or additional scrap paper are permitted. All information required is contained on the exam. Place all work in the space provided. If you require additional space, use the back of the exam. (1) Read each question carefully. (2) The last page contains a periodic table and some useful information. You may remove this for easy access. (3) Graded exams will be returned in lab sections next week. (4) Use CORRECT SIGNIFICANT FIGURES. (5) Show all work for partial credit. Answers without supporting calculations will be considered incorrect. Possible Points Points 1-3 (9 points) 4-7 (12 points) 8-11 (12 points) 12-13 (13 points) 14 (9 points) 15 (12 points) 16 (27 points) Total: 94

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Identify and circle the correct answers on your exam-no partial credit. Choose the answer that most closely matches your calculations. 36 Points 1. The standard molar enthalpy of formation for CO 2 (g) is -393.5 kJ/mol and that of CO (g) is -110.5 kJ/mol. Calculate the enthalpy of reaction for the following reaction: CO (g) + O 2 (g) CO 2 (g) [Not balanced] A. -566.0 kJ B. -504.0 kJ My error on this problem, as written, both are correct C. -283.0 kJ D. -1008 kJ E. +566.0 kJ 2. Which of the following would have a standard enthalpy of formation equal to 0? A. O 2 (l) B. Au (s) C. H 2 O (l) D. Fe (l) E. None of the above 3. If 250 J of heat is absorbed by the system from the surroundings and 300 J of work is performed by the system expanding, what is the total internal energy change of the system ( E)? A. 550 J
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## This note was uploaded on 06/15/2010 for the course CHEM 124 taught by Professor Hascall during the Winter '08 term at Cal Poly.

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Midterm 1 - Key - Name Section and Time Instructor Meadows...

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