Apthermoprac1rev07

Apthermoprac1rev07 - AP Chemistry Thermochemistry 6 At what...

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AP Chemistry Thermochemistry apthermoprac1rev07.doc Name: _______________________________ Date: _______________ Period: ____ 1. Which “type” of system best describes a hot bowl of soup? 2. What is the change in internal energy of a system that has 682J of work done on it and gives off 485J of heat? 3. When heat is absorbed by the system from the surroundings, the process is said to be __________________, and the sign of q process is ____________________. 4. Which is not true for an endothermic reaction? a. The temperature of the surroundings decreases. b. The enthalpy change for the reaction is positive. c. Heat flows from the surroundings into the system. d. The products have a lower enthalpy than the reactants. e. All of the above are true. 5. What are the signs for q and w if a system absorbs 180J of heat energy while expanding against a constant pressure? 6. At what velocity (m/s) must a 20.0g object be moving in order to possess a kinetic energy of 1.00J? 7. What is the change in internal energy for a system that performs 213kJ of work on its surroundings and loses 79kJ of heat in the process? 8. Which one of the following is false concerning internal energy, E?
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