chapter6q - Chapter 6 Thermochemistry Energy Flow and...

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Chapter 6 Thermochemistry Energy Flow and Chemical Change 1. A system that does no work but which transfers heat to the surroundings has A. q < 0, Δ E > 0 B. q < 0, Δ E < 0 C. q > 0, Δ E > 0 D. q > 0, Δ E < 0 E. q < 0, Δ E = 0 5. A system receives 575 J of heat and delivers 425 J of work. Calculate the change in the internal energy, Δ E , of the system. A. -150 J B. 150 J C. -l000 J D. 1000 J E. 575 J 9. A system initially has an internal energy E of 501 J. It undergoes a process during which it releases 111 J of heat energy to the surroundings, and does work of 222 J. What is the final energy of the system, in J? A. 168 J B. 390 J C. 612 J D. 834 J E. cannot be calculated without more information 13. Which one of the following relationships is always correct? A. potential energy + kinetic energy = constant B. E = q + w C. Δ E = Δ H - P Δ V D. H = E + PV E. Δ H = q v 17. Cold packs, whose temperatures are lowered when ammonium nitrate dissolves in water, are carried by athletic trainers when transporting ice is not possible. Which of the following is true of this reaction? A. Δ H < 0, process is exothermic B. Δ H > 0, process is exothermic C. Δ H < 0, process is endothermic D. Δ H > 0, process is endothermic E. Δ H = 0, since cold packs are sealed 21. Your favorite candy bar, Gummy Beakers, contains 1.2 × 10 6 J of energy while your favorite soft drink, Bolt, contains 6.7 × 10 5 J. If you eat two packs of Gummy Beakers a day and drink 3 cans of Bolt, what percent of your 2000 Calorie daily food intake is
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chapter6q - Chapter 6 Thermochemistry Energy Flow and...

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