2014 AP Chemistry化學真題系列之簡答題免費下載

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2014 AP Chemistry Free-Response Questions Free Download

2014 AP 化學簡答題部分免費下載

考試時會提供花常用的等式與常量

以及化學元素周期表

此套Section II試卷共7題

每道大題含有不同數量的小題

共計時90分鐘

其中1-3題各需20分鐘，每題10分

4-7題各需7分鐘，每題4分

完整版下載鏈接見文末

部分真題預覽：

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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