2011 AP Chemistry化学真题系列之简答题Form B免费下载

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2011 AP Chemistry Free-Response Questions （Form B）Free Download

2011 AP 化学简答题 Form B部分免费下载

考试时会提供花常用的等式与常量

以及化学元素周期表

此套Section II试卷共6题

每道大题含有不同数量的小题

共计时95分钟

Part A计55分钟，第1-3题各20分

Part B计40分钟，第四题值10分，第5第6题各15分

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部分真题预览：

Section II, Part A,YOU MAY USE YOUR CALCULATOR FOR PART A可使用计算器：

1）Answer the following questions about the solubility and reactions of the ionic compounds M(OH)₂ and MCO₃ , where M represents an unidentified metal.

1. Identify the charge of the M ion in the ionic compounds above.
2. At 25°C, a saturated solution of M(OH)₂ has a pH of 9.15.
   1. Calculate the molar concentration of OH^-(aq) in the saturated solution.
   2. Write the solubility-product constant expression for M(OH)₂ .
   3. Calculate the value of the solubility-product constant, K_sp , for M(OH)₂ at 25°C.
3. For the metal carbonate, MCO₃ , the value of the solubility-product constant, K_sp , is 7.4 × 10^-14 at 25°C. On the basis of this information and your results in part (b), which compound, M(OH)₂ or MCO₃ , has the greater molar solubility in water at 25°C ? Justify your answer with a calculation.
4. MCO₃ decomposes at high temperatures, as shown by the reaction represented below.
   A sample of MCO₃ is placed in a previously evacuated container, heated to 423 K, and allowed to come to equilibrium. Some solid MCO₃ remains in the container. The value of K_p for the reaction at 423 K is 0.0012.
   1. Write the equilibrium-constant expression for K_p of the reaction.
   2. Determine the pressure, in atm, of CO₂(g) in the container at equilibrium at 423 K.
   3. Indicate whether the value of ΔG° for the reaction at 423 K is positive, negative, or zero. Justify your answer.

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