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轉學考-普通化學
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91年 - 91 淡江大學 轉學考 普通化學#56133
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題組內容
15 predict the sign of the Gibbs free energy change for the reactions at low temperature, for which
(A) All is negative and AS is positive
其他申論題
(A) a double bond
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(B) a triple bond
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(A) HCl(g) in water and in pentane, C5H12(l).
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(B) Water in liquid LIF and in gasoline.
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(B) All is positive and AS is negative Explain your predictions.
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16 Docs the concentration of a homogeneous catalyst appear in (lie rate law for a catalyzed reaction? Explain.
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17 Explain why oxalic acid can be used to remove rust stains. Write a balanced equation for the reaction involved.
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18 The value of equilibrium constant for a reaction increases as the temperature is increased. Is the forward reaction exothermic or endothermic? What can one say about the enthalpy change for the reverse reaction?
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19 Both sodium chloride and magnesium oxide are ionic solids, yet magnesium oxide melts at a temperature about 2000 K higher than sodium chloride. Explain why.
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20 Explain why the structural isomers dimethyl ether (bp = -23 °C) and ethanol (bp = 78.3 °C) differ significantly in their boiling points? What simple chemical test could be used to distinguish ethanol from dimethyl ether?
#213294
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