eng-fall07-e8059x03a

eng-fall07-e8059x03a - University of North Florida CHM...

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University of North Florida Exam 3 CHM 2045C, General Chemistry I 2 November 2007 Fall 2007 NAME _____ ________________________ N # _____________________ Instructions: DO NOT BEGIN UNTIL GIVEN THE SIGNAL TO START. The time allotted for this examination is 50 minutes. Only allowed calculators may be used on this exam. The first three pages include some potentially helpful information and the periodic table. There are two parts to this exam. For part I, write your answers on the answer sheet. For part II, show all your work for full credit. No extra time will be given to transfer answers to the answer sheet. At the end of the examination, hand in the answer sheet and partial credit portion before leaving the room. Make sure your name is on those pages. Potentially useful information 1 in = 2.54 cm (exactly) 1 lb = 453.59 g 1 L = 1.0567 qt 1 amu = 1.66053873 × 10 -24 g e = 1.60217653 × 10 -19 C ° C = 5 / 9 ( ° F – 32) K = ° C + 273.15 N A = 6.0221421 × 10 23 1 J = 1 kg·m 2 /s 2 1 cal = 4.184 J (exactly) h = 6.6262×10 -34 Js c = 3.00×10 8 m/s R H = 1.09740×10 7 m -1 Rhc = 2.18×10 -18 J λ = h mv 1 1 1 1 2 2 2 = - R n n H
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NAME: ________________________ N #______________________ Exam 3
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NAME: ________________________ N #______________________ Exam 3 Part I. Problems 1 – 23 are worth 3.25 points each except for Problem 5 (3.5 pts). The maximum value for this part is 75 points. Each problem has ONE BEST ANSWER. Write the letter on the answer sheet. 1. Which of the following is NOT a state function? [a] temperature of water [b] volume of a balloon [c] internal energy [d] enthalpy [e] all of these are state functions 2. Which of the following types of energy is a form of potential energy? [a] electrical energy [b] mechanical energy [c] thermal energy [d] sound energy [e] gravitational energy 3. Calculate Δ E for a system during a process in which 142 J is absorbed by the system and 201 J of work is done by the system. [a] +343 J [b] 0 J [c] +59 J [d] –343 J [e] –59 J ________________________________________ For problems 4 through 6 consider the following reaction 2 Mg (s) + O 2 (g) 2 MgO (s) Δ = –1204 kJ The atomic and formula weights are Mg 24.3 g/mol O 16.00 g/mol MgO 40.3 g/mol 4. What is the enthalpy change when 3 moles of magnesium is completely reacted? [a]
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This note was uploaded on 07/10/2011 for the course CHM 2045 taught by Professor Eng during the Fall '10 term at UNF.

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eng-fall07-e8059x03a - University of North Florida CHM...

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