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Unformatted text preview: http:1Ichamrnacl.usc.edulcgi—bin/randquiz.cgi 3128108 11:32 PM Web Quiz You can login to this page multiple times but you cannot take the quiz more than once..
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bottom of the page only when you are sure of your answers. Question # 1 Assume that the enthalpy of fusion of ice is 6020 J/mol and does not vary appreciably over the temperature
range 270-290 K. If one mole of ice at 0°C is melted by heat supplied from surroundings at 280 K, what is the
entropy change in the surroundings, in MC? 0 A. 22
O B.21.5 O C.0
OD. -21.5 0 E. -22 Question # 2 A two-bulbed ﬂask contains seven particles. What is the probability of ﬁnding all seven particles on the left side? 0 A. 3.10%
O B. 0.32%
O C. 0.78%
O D. 0.93%
O E. 0.13% Question # 3 The second law of thermodynamics states that O A. the entropy of a perfect crystal is zero at 0 K.
O B. the entropy of the universe is constant. 0 C. the energy of the universe is increasing. 0 D. the entropy of the universe is increasing. 0 E. the energy of the universe is constant. Question # 4 The third law of thermodynamics states 0 A. the entropy of the universe is increasing.
0 B. the entropy of the universe is constant.
0 C. the entropy is zero at 0 K for a perfect crystal.
D. the absolute entropy of a substance decreases with increasing temperature. Page 1 of 3 littp:1Ichammac1.usc.edulcgi—bin/randquiz.cgi 3128108 11:32 PM 0 D. the absolute entropy of a substance decreases with increasing temperature.
0 E. the entropy of the universe equals the sum of the entropy of system and surroundings. Question # 5 The enthalpy of vaporization of ethanol is 38.7 kJ/mol at its boiling point (78°C). Calculate the value of DS when 1.00 mole of ethanol is vaporized at 780°C and 1.00 atm. O A. O O B. 496 J/K mol
0 C. 110. J/K mol
0 D. -110. JfK mol
0 E. -496 J/K mol Question # 6 A change of state that occurs in a system is accompanied by 64.0 H of heat, which is transferred to the
surroundings at a constant pressure and a constant temperature of 300. K. For this process DSsm.r is: O A. 64.0kJ O B. -64.0 k] C) C. -213 J/K O D. 213 MC 0 E. none of these Question # 7 At 1 atm, liquid water is heated above 100°C. DS for this process is O A. greater than zero. 0 B. less than zero. 0 C. equal to zero. 0 D. cannot be determined. Question # 8 For the process CHC13 (s) —* CHC13(I), DH“ = 9.2 kJ/mol and DS" = 43.9 J/mol*K. What is the melting point
of chloroform? O A. -63°C 0 B. 210°C 0 C. 5°C
D. 63°C Page 2 of 3 http:lIchamrnacl.usc.edulcgi—bin/randquiz.cgi 3128108 11:32 PM 0 D. 63°C
0 E. -5°C Question # 9 Which of the following is true for exothermic processes? 0 A. DS< 0
O B. DSsuIT = -DH/T
O C. DS= 0 O D. DS> 0
O E. two ofthese Question # 10 Consider the ﬁeezing of liquid water at -10°C. For this process what are the signs for DH, DS, and DG?
DH DS DG 0 A. + - 0 O B. - + 0 O C. - + - O D. + - - 013.- - - Page 3 of 3 ...
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- Spring '07