2010 AP Chemistry化学真题系列之简答题免费下载

历年AP Chemistry化学系列

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2010 AP Chemistry Free-Response Questions Free Download

2010 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）Several reactions are carried out using AgBr, a cream-colored silver salt for which the value of the solubility product constant, K_sp , is 5.0 × 10⁻¹³ at 298 K.

1. Write the expression for the solubility-product constant, K_sp , of AgBr.
2. Calculate the value of [Ag+] in 50.0 mL of a saturated solution of AgBr at 298 K.
3. A 50.0 mL sample of distilled water is added to the solution described in part (b), which is in a beaker with some solid AgBr at the bottom. The solution is stirred and equilibrium is reestablished. Some solid AgBr remains in the beaker. Is the value of [Ag⁺] greater than, less than, or equal to the value you calculated in part (b) ? Justify your answer.
4. Calculate the minimum volume of distilled water, in liters, necessary to completely dissolve a 5.0 g sample of AgBr(s) at 298 K. (The molar mass of AgBr is 188 g mol^-1.)
5. A student mixes 10.0 mL of 1.5 × 10⁻⁴ M AgNO³ with 2.0 mL of 5.0 × 10⁻⁴ M NaBr and stirs the resulting mixture. What will the student observe? Justify your answer with calculations.
6. The color of another salt of silver, AgI(s), is yellow. A student adds a solution of NaI to a test tube containing a small amount of solid, cream-colored AgBr. After stirring the contents of the test tube, the student observes that the solid in the test tube changes color from cream to yellow.
   1. Write the chemical equation for the reaction that occurred in the test tube.
   2. Which salt has the greater value of K_sp : AgBr or AgI ? Justify your answer.

 

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