2011 AP Chemistry化学真题系列之简答题免费下载

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2011 AP Chemistry Free-Response Questions Free Download

2011 AP 化学简答题部分免费下载

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

完整版下载链接见文末

部分真题预览：

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

2）A student is assigned the task of determining the mass percent of silver in an alloy of copper and silver by dissolving a sample of the alloy in excess nitric acid and then precipitating the silver as AgCl.

First the student prepares 50. mL of 6 M HNO₃ .

1. The student is provided with a stock solution of 16 M HNO₃ , two 100 mL graduated cylinders that can be read to ±1 mL, a 100 mL beaker that can be read to ±10 mL, safety goggles, rubber gloves, a glass stirring rod, a dropper, and distilled H₂O.
   1. Calculate the volume, in mL, of 16 M HNO3 that the student should use for preparing 50. mL of 6 M HNO₃.
   2. Briefly list the steps of an appropriate and safe procedure for preparing the 50. mL of 6 M HNO₃. Only materials selected from those provided to the student (listed above) may be used.
   3.  Explain why it is not necessary to use a volumetric flask (calibrated to 50.00 mL ±0.05 mL) to perform the dilution.
   4. During the preparation of the solution, the student accidentally spills about 1 mL of 16 M HNO₃ on the bench top. The student finds three bottles containing liquids sitting near the spill: a bottle of distilled water, a bottle of 5 percent NaHCO₃(aq), and a bottle of saturated NaCl(aq). Which of the liquids is best to use in cleaning up the spill? Justify your choice.
      Then the student pours 25 mL of the 6 M HNO3 into a beaker and adds a 0.6489 g sample of the alloy. After the sample completely reacts with the acid, some saturated NaCl(aq) is added to the beaker, resulting in the formation of an AgCl precipitate. Additional NaCl(aq) is added until no more precipitate is observed to form. The precipitate is filtered, washed, dried, and weighed to constant mass in a filter crucible. The data are shown in the table below.
2. Calculate the number of moles of AgCl precipitate collected.
3. Calculate the mass percent of silver in the alloy of copper and silver.

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