Thermodynamics and Thermochemistry

Thermodynamics and Thermochemistry - Unit 9: Thermodynamics...

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Unit 9: Thermodynamics and Unit 10: Thermochemistry – 50 point quiz (MC = 2 points each, SA = 10 points) 1. Two samples of gold that have different temperatures are placed in contact with one another. Heat will flow spontaneously from a sample of gold at 60 o C to a sample of gold that has a temperature of a. 50 o C c. 70 o C b. 60 o C d. 80 o C 2. What is the total number of joules released when a 5.00-gram sample of water changes from liquid to solid at 0 o C? a. 334 J b. 1670 J c. 2260 J d. 11,300 J 3. Given the potential energy diagram for a chemical reaction: Which statement describes the energy changes that occur in the forward reaction? a. The activation energy is 10. kJ and the reaction is endothermic b. The activation energy is 10. kJ and the reaction is exothermic c. The activation energy is 50. kJ and the reaction is endothermic d. The activation energy is 50. kJ and the reaction is exothermic 4. Systems in nature tend to undergo changes toward a. Lower energy and lower entropy b. Lower energy and higher entropy c. Higher energy and lower entropy d. Higher energy and higher entropy 5. Adding a catalyst to a chemical reaction results in a. A decrease in the activation energy and a decrease in the reaction rate b. A decrease in the activation energy and an increase in the reaction rate c. An increase in the activation energy and a decrease in the reaction rate d. An increase in the activation energy and an increase in the reaction rate 6. A catalyst increases the rate of a chemical reaction by a. Lowering the activation energy of the reaction b. Lowering the potential energy of the products c. Raising the temperature of the reactants d. Raising the concentration of the reactants 7. Which form of energy is converted to thermal energy when propane burns in air?
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This note was uploaded on 01/01/2012 for the course CHEM 101 taught by Professor Donahue during the Spring '11 term at Long Island U..

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Thermodynamics and Thermochemistry - Unit 9: Thermodynamics...

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