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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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17 Explain why oxalic acid can be used to remove rust stains. Write a balanced equation for the reaction involved.
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(B) Water in liquid LIF and in gasoline.
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(A) All is negative and AS is positive
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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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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?
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【已刪除】1. (10%) Determine whether the set of column vectors is linearly independent.
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(a) Find a basis for the row space of the matrix A.
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(b) What is the rank of A?
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