2014 AP Chemistry化学真题系列之简答题免费下载

历年AP Chemistry化学系列

真题与答案下载

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2014 AP Chemistry Free-Response Questions Free Download

2014 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7题

每道大题含有不同数量的小题

共计时90分钟

其中1-3题各需20分钟，每题10分

4-7题各需7分钟，每题4分

完整版下载链接见文末

部分真题预览：

1）A student is given the task of determining the I^- content of tablets that contain KI and an inert, water-soluble sugar as a filler. A tablet is dissolved in 50.0 mL of distilled water, and an excess of 0.20 M Pb(NO₃)₂(aq) is added to the solution. A yellow precipitate forms, which is then filtered, washed, and dried. The data from the experiment are shown in the table above.

1. For the chemical reaction that occurs when the precipitate forms,
   1. write a balanced, net-ionic equation for the reaction, and
   2. explain why the reaction is best represented by a net-ionic equation.
2. Explain the purpose of drying and weighing the filter paper with the precipitate three times.
3. In the filtrate solution, is [K⁺] greater than, less than, or equal to [NO₃^-] ? Justify your answer.
4. Calculate the number of moles of precipitate that is produced in the experiment.
5. Calculate the mass percent of I^- in the tablet.
6. In another trial, the student dissolves a tablet in 55.0 mL of water instead of 50.0mL of water. Predict whether the experimentally determined mass percent of I^-  will be greater than, less than, or equal to the amount calculated in part (e). Justify your answer.

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