# ch05 - Chapter 5 The Flow of Energy Multiple-Choice...

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Chapter 5: The Flow of Energy Multiple-Choice Questions 1. Introduction; p. 89; easy; ans: e Of the total solar energy that reaches the Earth, ______ percent is captured by the cells of photosynthetic organisms. a. about 50 b. about 20 c. about 10 d. about 5 e. less than 1 2. The Laws of Thermodynamics; p. 89; easy; ans: c The first law of thermodynamics states that: a. all natural processes proceed in such a direction that the disorder of the universe increases. b. the activation energy of chemical reactions is raised by enzymes. c. energy can be changed from one form to another, but it cannot be created or destroyed. d. ΔG = ΔH - TΔS. e. ATP is the energy currency of the cell. 3. The Laws of Thermodynamics; p. 89; easy; ans: c The energy of a system is defined as: a. the amount of caloric present. b. the amount of ATP present. c. its capacity to do work. d. the sum total of its chemical bonds. e. the speed at which its atoms and molecules move. 4. The Laws of Thermodynamics; p. 90; moderate; ans: d According to the first law of thermodynamics, the total energy of ______ is ______. a. a system; constant b. a system; changeable c. the surroundings; constant d. the universe; constant e. the universe; changeable 5. The Laws of Thermodynamics; p. 90; moderate; ans: d Which of the following is NOT an example of potential energy? a. A charged flashlight battery b. A boulder at the top of a hill c. A tank of gasoline d. Water at the bottom of a waterfall e. An apple on a branch

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6. The Laws of Thermodynamics; p. 90; easy; ans: a The first law of thermodynamics states that the total energy of a system and its surroundings after an energy conversion is ______ the total energy before the conversion. a. equal to b. greater than or equal to c. greater than d. less than e. less than or equal to 7. The Laws of Thermodynamics; p. 91; easy; ans: b One way of stating the second law of thermodynamics is: a. although energy can be changed from one form to another, it can be neither created nor destroyed. b. the entropy of the universe is increasing. c. free energy is equal to the total potential energy minus the entropy. d. enthalpy is the total potential energy of a system. e. the activation energy of a reaction is always positive. 8. The Laws of Thermodynamics; p. 91; moderate; ans: b An endergonic reaction: a. is a reaction in which the potential energy of the final state is less than that of the initial state. b. does not take place spontaneously. c. takes place without an input of energy from the outside. d. releases energy. e. has a negative Δ G value. 9. The Laws of Thermodynamics; p. 91; difficult; ans: c Δ H refers to the: a. heat released in an exergonic reaction. b. heat released in an endergonic reaction. c. change in enthalpy. d. change in entropy. e. exact change in potential energy. 10. The Laws of Thermodynamics; p. 91; easy; ans: d Entropy refers to the ______ of a system.
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