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Answer key is provided for the full 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is entropy related to disorder in this test?","Question",{"text":63,"@type":64},"Entropy is identified as the thermodynamic quantity expressing the degree of disorder in a system.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"What determines whether a system is spontaneous at different temperatures according to the test?",{"text":68,"@type":64},"The test uses the signs of ΔH and ΔS° to decide spontaneity under standard conditions and how spontaneity can change between low and high temperatures.",{"name":70,"@type":61,"acceptedAnswer":71},"How can equilibrium be inferred from free energy?",{"text":72,"@type":64},"The test asks what can be said when free energy reaches a minimum, indicating the system has achieved equilibrium.",{"name":74,"@type":61,"acceptedAnswer":75},"How do you compute ΔG° or equilibrium behavior using equilibrium constants provided?",{"text":76,"@type":64},"The test includes a reaction with a given equilibrium constant at 25° and asks for ΔG°, linking K to 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best completes the statement or answers the question.  \n1)The thermodynamic quantity that expresses the degree of disorder in a system is        \nA)entropy  \nB)internal energy  \nC)heat flow  \nD)enthalpy  \nE)bond energy  \n2)Which one of the following is always positive when a spontaneous process occurs?  \nA)△HunivB)△HsurrC)△SsurrD)△SunivE)△Ssys  \n3)△S will be positive for the reaction_          \nA)2H2(g)+O2(g)→2H₂O(g)  \nB)2NO₂(g)→N₂O4(g)  \nC)BaF₂(s)→Ba2+(aq)+2F-(aq)  \nD)2Hg(1)+O2(g)→2HgO(s)  \nE)CO₂(g)→CO₂(s)  \n4)Which one of the following processes produces a decrease in the entropy of the system?  \nA)dissolution of solid KCl in water  \nB)mixing of two gases into one container  \nC)freezing water to form ice  \nD)melting ice to form water  \nE)boiling water to form steam  \n5)Of the following,the entropy of gaseous.    is the largest at 25℃ and 1 atm.  \nA)C₂H₂B)H2C)C2H₆D)CH4E)C₂H2  \nUse the table below to ansver the questions that follow.  \nThermodynamic Quantities for Selected Substances at 298.15K(25C)  \n\n| Substance   | △H°f(kJ/mol)   | △G°f(kJ/mol)   | S(J/K-mol)   |\n| --- | --- | --- | --- |\n| Carbon   |  |  |  |\n| C(s,diamond)   | 1.88   | 2.84   | 2.43   |\n| C(s,graphie)   | 0   | 0   | 5.69   |\n| C₂H₂(g)   | 226.7   | 209.2   | 200.8   |\n| C2H4(g)   | 52.30   | 68.11   | 219.4   |\n| C₂H₆(g)   | -84.68   | -32.89   | 229.5   |\n| CO(g)   | -110.5   | -137.2   | 197.9   |\n| CO₂(g)   | -393.5   | -394.4   | 213.6   |\n| Hydrogen   |  |  |  |\n| H₂(g)   | 0   | 0   | 130.58   |\n| Oxygen   |  |  |  |\n| O2(g)   | 0   | 0   | 205.0   |\n| H₂O(1)   | -285.83   | -237.13   | 69.91   |\n\n6)The value of △S°for the catalytic hydrogenation of acetylene to ethene,  \nC₂H₂(g)+H₂(g)→C₂H₄(g)is_J/K.  \n   \nD)+550.8E)-112.0A)-18.6B)+18.6C)+112.0  \n7)What can be said about a chemical system that has reached a minimum in free energy?  \nA)The reaction is complete.  \nB)The system entropy is zero.  \nC)The system has achieved equilibrium.  \nD)The temperature is OK.  \nE)The reaction is very fast.  \nUse the table below to answer the questions that follow.  \nThermodynamic Quantites for Selected Substances at 298.15K(25℃)  \n\n| Substance   | △H°f(kJ/mol)   | △G°f(kJ/mol)   | S(J/K-mol)   |\n| --- | --- | --- | --- |\n| Calcium   |  |  |  |\n| Ca(s)   | 0   | 0   | 41.4   |\n| CaCl₂(s)   | -795.8   | -748.1   | 104.6   |\n| Ca2+(aq)   | 226.7   | 209.2   | 200.8   |\n| Chlorine   |  |  |  |\n| Cl2(g)   | 0   | 0   | 222.96   |\n| Cl-(aq)   | -167.2   | -131.2   | 56.5   |\n| Oxygen   |  |  |  |\n| O2(g)   | 0   | 0   | 205.0   |\n| H₂O(1)   | -285.83   | -237.13   | 69.91   |\n| Phosphorus   |  |  |  |\n| P2(g)   | 144.3   | 103.7   | 218.1   |\n| PCl₃(g)   | -288.1   | -269.6   | 311.7   |\n| POCl₃(g)   | -542.2   | -502.5   | 325   |\n| Sulfur   |  |  |  |\n| S(s,rhombic)   | 0   | 0   | 31.88   |\n| SO₂(g)   | -269.9   | -300.4   | 248.5   |\n| SO₃g)   | -395.2   | -370.4   | 256.2   |\n\n8)The value of △H°for the oxidation of solid elemental sulfur to gaseous sulfur trioxide,2S(s,rhombic)+3O2(g)→2SO₃(g)is     kJ/mol.  \nA)+790.4B)-395.2C)+395.2D)+105.1E)-790.4  \n9)The value of AG°at 25℃ for the formation of POCl₃from its constituent elements,P₂(g)+O₂(g)+3Cl₂(g)→2POCl₃(g)is_        kJ/mol.  \nA)-606.2B)-1,005C)+606.2D)+1,109E)-1,109  \n10)The equilibrium position corresponds to which letter on the graph of G vsf(course of reaction)below?Course of Reaction(1)  \nA)AB)BC)CD)DE)E  \n11)For the reaction  \nC₂H₆(g)→C₂H4(g)+H2(g)  \n△H°is+137 kJ/mol and △S°is+120 J/K.mol.This reaction is.  \n   \nA)nonspontaneous at all temperatures  \nB)unreliable  \nC)spontaneous only at high temperature  \nD)spontaneous at all temperatures  \nE)spontaneous only at low temperature  \n12)A reaction that is not spontaneous at low temperature can become spontaneous at high temperature if △H is  \nA)+.+and Sis._          _  \nE)+,0B)-,-C)+,-D)-+  \n13)For a reaction to be spontaneous under standard con","cbCaiulnl77a6qwk","https://ap.wps.com/l/cbCaiulnl77a6qwk","pdf",2791243,18,"English","# Multiple Choice Questions\n## Thermodynamic quantities and spontaneity\n## Entropy, enthalpy, and standard free energy calculations\n## Equilibrium, ΔG°, and K computations\n## Answer key","[{\"question\":\"How is entropy related to disorder in this test?\",\"answer\":\"Entropy is identified as the thermodynamic quantity expressing the degree of disorder in a system.\"},{\"question\":\"What determines whether a system is spontaneous at different temperatures according to the test?\",\"answer\":\"The test uses the signs of ΔH and ΔS° to decide spontaneity under standard conditions and how spontaneity can change between low and high temperatures.\"},{\"question\":\"How can equilibrium be inferred from free energy?\",\"answer\":\"The test asks what can be said when free energy reaches a minimum, indicating the system has achieved equilibrium.\"},{\"question\":\"How do you compute ΔG° or equilibrium behavior using equilibrium constants provided?\",\"answer\":\"The test includes a reaction with a given equilibrium constant at 25° and asks for ΔG°, linking K to standard free energy, and another question computing K from thermodynamic data.\"}]","A.P.Chemistry Practice Test - Ch.16 - Spontaneity, Entropy, and Free Energy | PDF",1790761695,45]