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Thermochemistry Review

Thermochemistry Review. Chapter 16. A piece of metal is heated, then submerged in cool water. Which statement below describes what happens? a. The temperature of the metal will increase. b. The temperature of the water will increase. c. The temperature of the water will decrease.

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Thermochemistry Review

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  1. Thermochemistry Review Chapter 16

  2. A piece of metal is heated, then submerged in cool water. Which statement below describes what happens? a. The temperature of the metal will increase. b. The temperature of the water will increase. c. The temperature of the water will decrease. d. The temperature of the water will increase and the temperature of the metal will decrease.

  3. Which of the following is NOT a form of energy? a. light c. heat b. Pressure d. electricity

  4. What is the amount of heat required to raise the temperature of 200.0 g of aluminum by 10.0 C? (specific heat of aluminum = 0. 21cal/gC) a. 420 cal c. 42,000 cal b. 4200 cal d. 420,000 cal

  5. Calculate the energy required to produce 7.00 mol ClO on the basis of the following balanced equation. 2Cl(g) + 7O(g) + 130 kcal  2ClO(g) a. 7.00 kcal c. 130 kcal b. 65 kcal d. 455 kcal

  6. What is the standard heat of reaction for the following reaction? Zn(s) + Cu (aq)  Zn(aq) + Cu(s) (Hf for Cu(aq)=+64.4 kJ/mol; Hf for Zn(aq)= –152.4 kJ/mol) a. 216. 8 kJ released per mole b. 88. 0 kJ released per mole c. 88. 0 kJ absorbed per mole d. 216. 8 kJ absorbed per mole

  7. During a phase change, the temperature of a substance ____. a. increases c. remains constant b. decreases d. may increase or decrease

  8. Calculate H for the reaction of sulfur dioxide with oxygen.2SO2(g) + O2(g)  2SO3(g)(Hf SO2(g) = –296.8 kJ/mol; Hf SO3(g) = –395.7 kJ/mol) a. -98.9 kJ c. +197.8 kJ b. -197.8 kJ d. not enough info

  9. Which of the following substances has the highest specific heat? a. steel c. alcohol b. water d. chloroform

  10. When the molecules of gases are heated, the average kinetic energy of the molecules increases. a. TRUE b. FALSE

  11. Which of the following rumors about Mrs. Dogancay is TRUE? a. Her natural hair color is blonde b. She is actually 65, but has had a lot of plastic surgery c. She comes from a family of 9. d. She used to teach AP Calculus.

  12. For a process, the enthalpy change of a system is 1.25 x105 J and the entropy change is 300.0 J/K. Calculate the free energy change of the system at 290 K. a. 8.7 x 104 J c. 1.2 x105 J b. 3.8 x 104 J d. 1.2 x104 J

  13. A process that absorbs heat is a(n)___. a. endothermic process b. exothermic process c. polythermic process d. ectothermic process

  14. When 45 g of an alloy, at 25C, are dropped into 100.0 g of water, the alloy absorbs 956 J of heat. If the final temperature of the alloy is 37C, what is its specific heat? a. 0.423 cal/gC c. 9.88 cal/gC b. 1.77 cal/gC d. 48.8 cal/gC

  15. The amount of heat transferred from an object depends on which of the following? a. the specific heat of the object b. the initial temperature of the object c. the mass of the object d. all of the above

  16. Calculate the energy released when 24.8 g Na2O reacts in the following reaction. Na2O(s) + 2HI(g)  2NaI(s) + H2O(l) H = –120.00 kcal a. 0.207 kcal c. 48.0 kcal b. 2.42 kcal d. 3.00x102 kcal

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