2012 AP Chemistry化学真题系列之简答题免费下载

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2012 AP Chemistry Free-Response Questions Free Download

2012 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：

1）A 1.22 g sample of a pure monoprotic acid, HA, was dissolved in distilled water. The HA solution was then titrated with 0.250 M NaOH. The pH was measured throughout the titration, and the equivalence point was reached when 40.0 mL of the NaOH solution had been added. The data from the titration are recorded in the table below.

1. Explain how the data in the table above provide evidence that HA is a weak acid rather than a strong acid.
2.  Write the balanced net-ionic equation for the reaction that occurs when the solution of NaOH is added to the solution of HA .
3. Calculate the number of moles of HA that were titrated.
4. Calculate the molar mass of HA .
   The equation for the dissociation reaction of HA in water is shown below.
   
5.  Assume that the initial concentration of the HA solution (before any NaOH solution was added) is 0.200 M. Determine the pH of the initial HA solution.
6. Calculate the value of [H₃O⁺] in the solution after 30.0 mL of NaOH solution is added and the total volume of the solution is 80.0 mL.

 

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