CHEM1310F11_Midterm_Answers

CHEM1310F11_Midterm_Answers - CHEM 1310 midterm, Fall 2011...

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CHEM 1310 midterm, Fall 2011 PART A 1. Which one of the following statements is incorrect : a. Thermal energy is energy associated with random molecular motion b. Chemical energy is associated with chemical bonds and intermolecular forces c. Energy is released when bonds are broken. d. Energy cannot be created or destroyed in any process, though it may be transferred from one body to another or transformed from one form to another. e. Work is done when a force acts through a distance 2. Which of the following processes could result in E sys = –95 J? a. The system and the surroundings are cooled via a transfer of 95 J to the universe. b. The system performs 95 J of work on the surroundings with no temperature change. c. The system is allowed to expand by 1.0 L against an external pressure of 40 kPa while 55 J of heat is transferred to the system from the surroundings. d. The system is compressed by 1.0 L by an external pressure of 95 kPa. e. All of the above processes will result in E sys = –95 J. 3. 1.64 mol of nickel at 150.13ºC is placed in 1.00 L of water at 25.09ºC. The final temperature of the nickel-water mixture is 26.34ºC. What is the specific heat of nickel? a. 0.439 J K -1 mol -1 b. 0.554 J K -1 mol -1 c. 2.28 J K -1 mol -1 d. 25.7 J K -1 mol -1 e. 31.6 J K -1 mol -1 4. 90.0 g of oxalic acid, C 2 H 2 O 4 (90.0 g/mol), is combusted in a bomb calorimeter whose heat capacity is 4.60 kJ/ºC. The temperature in the calorimeter rises from 25.0ºC to 79.6ºC. What is Δ E for the combustion of oxalic acid? a. –21.2 kJ/mol b. –54.6 kJ/mol c. –126 kJ/mol d. –211 kJ/mol e. –251 kJ/mol 5. Given the average bond energies for C-Br and C-O below, what can be predicted about the thermochemistry of the following reaction: ( ) ( ) ( ) ( ) 3 3 OH CH Br CH OH Br aq aq aq aq - - + + C–Br: 288 kJ/mol C–O: 360 kJ/mol a. The reaction is exothermic, releasing approximately 72 kJ/mol b. The reaction is endothermic, requiring approximately 72 kJ/mol c. The reaction is exothermic, releasing approximately 288 kJ/mol d. The reaction is exothermic, releasing approximately 648 kJ/mol e. The reaction is endothermic, requiring approximately 648 kJ/mol
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CHEM 1310 midterm, Fall 2011 6. The reaction that is associated with the standard enthalpy of formation, o f H Δ for glucose, C 6 H 12 O 6 ( s ), is: a. 6 C ( s, graphite ) + 6 H 2 O ( l ) C 6 H 12 O 6 ( s ) b. 6 C ( s, graphite ) + 12 H ( g ) + 6 O ( g ) C 6 H 12 O 6 ( s ) c. 6 C ( s, graphite ) + 6 H 2 ( g ) + 3 O 2 ( g ) C 6 H 12 O 6 ( s ) d. 2 C 2 H 5 OH ( l ) + 2 CO 2 ( g ) C 6 H 12 O 6 ( s ) e. 6 C ( g ) + 6 H 2 ( g ) + 3 O 2 ( g ) C 6 H 12 O 6 ( s ) 7. Which one of the following processes is exothermic? a.
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This note was uploaded on 12/19/2011 for the course AP CHEM 1300 taught by Professor James during the Fall '11 term at Manitoba.

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CHEM1310F11_Midterm_Answers - CHEM 1310 midterm, Fall 2011...

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