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Outline:
 1.25) Name the following compound.A) 1-butanoateB) 1-butanalC) butanoic acidD) propyl methanoateE) propyl butanoateAnswer: C
演講者: 洪國明
觀看 (225), 討論 (0)
演講日期: 2015-07-04
上架時間: 2015-07-05
上傳者: energy4104
00:30
Outline:
 1.The ________ Law of Thermodynamics states the energy is conserved in chemical processes.A) Zero B) First C) Second D) Third E) FourthAnswer: B
演講者: 洪國明
觀看 (584), 討論 (0)
演講日期: 2015-06-07
上架時間: 2015-06-08
上傳者: energy4104
00:35
Outline:
 1.2) Which is necessarily true for a spontaneous process?A) ΔSuniverse > 0B) Δ E > 0C) q = 0D) Δ H < 0E) Δ S°system > 0Answer: A
演講者: 洪國明
觀看 (485), 討論 (0)
演講日期: 2015-06-07
上架時間: 2015-06-08
上傳者: energy4104
01:03
Outline:
 1.3) Calculate the Δ G°rxn using the following information. 4 HNO3(g) + 5 N2H4(l) →7 N2(g) + 12 H2O(l) Δ G°rxn = ?Δ G°f (kJ/mol) -73.5 149.3 -237.1A) +954.7 kJB) +2.845 x 103 kJC) -954.7 kJD) -3.298 x 103 kJE) -312.9 kJAnswer: D
演講者: 洪國明
觀看 (520), 討論 (0)
演講日期: 2015-06-07
上架時間: 2015-06-08
上傳者: energy4104
00:40
Outline:
 1.4) Calculate Δ Grxn at 298 K under the conditions shown below for the following reaction.  (R = 8.314 J·mol-1·K-1)2 Hg(g) + O2(g) →2 HgO(s) Δ G° = -180.8 kJP(Hg) = 0.025 atm, P(O2) = 0.037 atmA) -164 kJ B) -154.4 kJ C) -26.5 kJ D) +207 kJ E) +60.7 kJAnswer: B
演講者: 洪國明
觀看 (535), 討論 (0)
演講日期: 2015-06-08
上架時間: 2015-06-08
上傳者: energy4104
01:03
Outline:
 1.5) For an exothermic reaction to be nonspontaneous at high temperatures, the enthalpy must be ________ while the entropy is ________.A) positive, negativeB) a relatively small negative value, also negativeC) positive, also positiveD) a relatively large negative value, positiveE) a very large negative value, also negativeAnswer: B
演講者: 洪國明
觀看 (566), 討論 (0)
演講日期: 2015-06-07
上架時間: 2015-06-08
上傳者: energy4104
01:08
Outline:
 1.6) Which statement is true for the freezing of liquid water below 0 °C?Δ H is positive; Δ S is positive; Δ G is positive Δ H is positive; Δ S is negative; Δ G is negativeC) Δ H is positive; Δ S is negative; Δ G is positive D) Δ H is negative; Δ S is negative; Δ G is negativeAnswer: D
演講者: 洪國明
觀看 (392), 討論 (0)
演講日期: 2015-06-07
上架時間: 2015-06-08
上傳者: energy4104
00:48
Outline:
 1.7) Above what temperature, in °C, will the following reaction become spontaneous? Assume enthalpy and entropy are not temperature dependent.    CCl4(g) →C(s, graphite) + 2 Cl2(g)     Δ H = + 95.7 kJ; Δ S = +142.2 J/KA) 150B) 400C) 25D) This reaction is nonspontaneous at all temperatures.E) This reaction is spontaneous at all temperatures.Answer: B
演講者: 洪國明
觀看 (372), 討論 (0)
演講日期: 2015-06-07
上架時間: 2015-06-08
上傳者: energy4104
01:01
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