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1032第三次化學會考考題影音詳解  
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 1.The ________ Law of Thermodynamics states the energy is conserved in chemical processes.A) Zero B) First C) Second D) Third E) FourthAnswer: B
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00:35
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 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
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01:03
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 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
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00:40
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 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
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01:03
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 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
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01:08
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 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
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00:48
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 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
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01:01
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 1.8) Place the following in order of increasing entropy at 298 K.     Ne   Xe   He   Ar   KrA) He < Ne < Ar < Kr < XeB) Ar < He < Ar < Ne < KrC) He < Kr < Ne < Ar < XeD) Ar < Ne < Xe < Kr < HeE) Xe < Kr < Ar < Ne < HeAnswer: A
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00:41
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 1.9) Which reaction is most likely to have a positive  Δ Ssys ?CO(g) + Cl2(g) →COCl2(g) B) SiO2(s) + 3 C(s) → SiC(s) + 2 CO(g)C) 3 NO2(g) + H2O(l) →2 HNO3(l) + NO(g) D) 6 CO2(g) + 6 H2O(g) → C6H12O6(s) + 6 O2(g)Answer: B
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01:23
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 1.10) The molar heat of vaporization for ethanol is 37.4 kJ/mol. If the boiling point of ethanol is 78.0°C, calculate Δ S for the vaporization of 0.500 mol ethanol, in J/K.A) 0.0535 B) 479 C) 53.5 D) 0.240 E) 107Answer: C
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00:51
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