# Chapter 17 Thermochemistry

15 Questions  I  By Verdun
Chapter 17 THERMOCHEMISTRY

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 1 The SI unit of energy is
 A. Heat capacity.
 B. Calorie.
 C. Joule.
 D. Enthalpy.
 2 How many calories are required to raise the temperature of 75.0 g of water from 20C to 50C?
 A. 2250 cal
 B. 3750 cal
 C. 75.0 cal
 3 If 1 Calorie  4.18 kJ, how many kJ of energy can be released by an apple containing 125 Cal?
 A. 522 kJ
 B. 29.9 kJ
 C. 5.22  105 kJ
 4 The temperature of a 6.0-g sample of glass changed from 20C to 45C when it absorbed 550 J of heat. What is the specific heat of this glass sample?
 A. C0.27 J/gpC
 B. 3.7 J/gp
 C. 2300 J/gpC
 5 The enthalpy of a system is the same as its:
 A. Specific heat.
 B. Heat of combustion.
 C. Heat content.
 6 When your body is warmed by an electric blanket during the winter, this process is said to be
 A. Endothermic.
 B. Exothermic.
 C. Isothermic.
 7 A student mixes two water solutions with an initial temperature of 25.0C to form a final solution with a mass of 65.0 g at 30.0C. What is the heat change, in kJ, for this reaction?
 A. 325 kJ
 B. 272 kJ
 C. 1.36 kJ
 8 Given the equation 2Mg(s)  O2(g) y2MgO(s)  72.3 kJ, which of the following is true?
 A. The reaction is endothermic.
 B. ^H72.3 kJ
 C. ^H72.3 kJ
 9 Given the equation in question 18, how much heat is involved in the production of 5.0 mol of MgO?
 A. 72 kJ
 B. 360 kJ
 C. 180 kJ
 10 Given the equation Si(s) + 2Cl2(g) ------>SiCl2(g) ------>SiCl2(l) + 687 kJ, how much heat is produced when 106 g of Cl2 react?
 A. 513 kJ
 B. 360 kJ
 C. 180 kJ
 11 Which of the following statements is true?
 A. ^Hfus^Hsolid
 B. ^Hfus^Hsolid
 C. ^Hsolid is always positive.
 12 How much heat, in kJ, is required to melt 54.0 g of ice at 0C into water at 0C if ^Hfus for water = 6.01 kJ/mol?
 A. 0.111 kJ
 B. 325 kJ
 C. 18.0 kJ
 13 How much heat is required to convert 9.00 g of water at 100C into steam at 100C, if ^Hvap for water = 40.7 kJ/mol?
 A. 20.4 kJ
 B. 366 kJ
 C. 18.0 kJ
 14 If the molar heat of solution of NH4NO3 is 25.7 kJ/mol, how much heat (in kJ) would be required to dissolve 20.0 g of NH4NO3 in water?
 A. 0.250 kJ
 B. 514 kJ
 C. 6.43 kJ
 15 Calculate the enthalpy change, H in kJ, for the reaction H2O(s) ---->H2(g) + 1/2O2(g) Use the following: H2(g) + 12O2(g) ---->H2O(l)     ^H= 285.9 kJ H2O(s) yH2O(l) H+6.0 kJ
 A. 291.9 kJ
 B. +291.9 kJ
 C. 279.9 k
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