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problem set exam 2 KEY

problem set exam 2 KEY - Mr Key CHM 114A/C Fall 2007 Pam...

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Mr. Key CHM 114A/C, Fall 2007 Pam Marks Preparation for Exam 2 Chapters 5, 6, 7 (7.1-7.4), and 8 Timo Park, 1/28/2010
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Understand material from Exam 1 as it applies to Exam 2 content. Chapter 5: 1. Describe kinetic energy and potential energy and components of the internal energy ( E ) of a substance. ( Internal energy ) Which of the followings is not true? (a) Internal energy can be described as the sum of its potential energy and its kinetic energy (b) Kinetic energy is depends on the mass and velocity of the object that is moving (c) The chemical energy of a substance is due to the potential energy stored in the arrangements of the atoms of the substance (d) Magnetic and electric forces are not considers as the potential energy (e) The Arizona Diamondbacks are favored to win the World Series this year 2. Describe how the change in internal energy (Δ E ) is relative to heat transfers and work. ( Internal energy, Heat and work ) Which of these statements is false? (a) Generally, it is impossible to know the actual numerical value of internal energy (E) (b) A positive value of q means that heat has been absorbed by the system (c) E, q, and w are all state functions (d) The value of w is positive when work is done on the system (e) At constant pressure, Δ H = q p 3. Define endothermic and exothermic processes in terms of the changes that occur to the system and surround- ings. Reactants Products Reactants Products Energy Energy Reaction A Reaction B Begin End Begin End ( Exothermic and endothermic reaction ) which of the following statements is true ? (a) Reaction A and B are both exothermic (b) Reaction A and B both have the same value of Δ E rxn (c) Reaction B would be expected to absorb energy from the surroundings (d) There is no net change in energy (e) You are so excited for the exam 2 4. Know which conditions allow enthalpy change, H , to be used to describe heat transfer. ( Heat and enthalpy changes ) which of the followings is not true? (a) The change in enthalpy equals the heat added to or lost by the system when the process occurs under constant pressure Timo Park, 1/28/2010
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(b) We do not measure enthalpy directly , rather we are concerned about the heat added or lost by the system (c) H represents the difference between the enthalpy of the system at the beginning of the reaction compared to what it is at the end of the reaction (d) Heat flows between the system and surroundings until the two are at the same temperature (e) Enthalpy is defined as the sum of the internal energy minus the product of P-V work
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