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Unformatted text preview: 1 Name _________________________________ TA ______________________________________ Lab Section Number Dr. Land Spring 1999 CHEMISTRY 2B Midterm I Instructions: CLOSED BOOK EXAM No books or notes allowed. All information required is contained on the exam. Place all work in space provided. If you require additional space, use the back of the exam. (1) Read each question carefully. (2) There is no partial credit for problems in Part I. (3) Show work in Part II. Credit will be given only for work shown. (4) The last page contains potentially useful info and a periodic table. You may remove this for easy access. (5) Graded exams will be returned in discussion sections next week. Page: Possible Points Points 2. 50 points 3. 50 points 4. 35 points 5. 45 points 6. 45 points 7. 25 Total Score (250) If you finish early, RECHECK YOUR ANSWERS. UC Davis is an Honor Institution 2 Part I: Multiple Choice - No Partial Credit 1. (10 pts) At 0 C the enthalpy of melting of water is 6.0 kJ mol-1 . The enthalpy change when 36 g of water freezes is a. +12 kJ b. -12 kJ c. -6.0 kJ d. +6.0 kJ e. 0 kJ 2. (10 pts) The standard enthalpy of formation of benzene, C 6 H 6 (l), is +49.0 kJmol-1 and of acetylene, C 2 H 2 (g), is +226.7 kJ mol-1 . What is the reaction enthalpy for formation of 1 mol of benzene from acetylene? a. +177.7 kJ b. -177.7 kJ c. -631.1 kJ d.+275.7 kJ e. +49.0 kJ 3. (15 pts) What are the number of atoms per unit cell and the coordination number (CN) for a face centered cubic lattice? a. 8 atoms; CN = 12 b. 2 atoms; CN = 8 c. 2 atoms; CN = 12 d. 1 atom; CN = 6 e. 4 atoms; CN = 12 4. (15 pts) Calculate U for a system that absorbs 325 kJ of heat and has 65 kJ of work done on the system....
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This test prep was uploaded on 04/05/2008 for the course CHE 002B taught by Professor Land during the Winter '08 term at UC Davis.
- Winter '08