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2013 AP Chemistry Free-Response Questions Free Download

2013 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6題

每道大題含有不同數量的小題

共計時95分鐘

Part A計55分鐘，第1-3題各20分

Part B計40分鐘，第四題值10分，第5第6題各15分

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部分真題預覽：

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

1）Answer the following questions about the solubility of some fluoride salts of alkaline earth metals.

1. A student prepares 100. mL of a saturated solution of MgF₂ by adding 0.50 g of solid MgF₂ to 100. mL of distilled water at 25°C and stirring until no more solid dissolves. (Assume that the volume of the undissolved MgF₂ is negligibly small.) The saturated solution is analyzed, and it is determined that [F^-] in the solution is 2.4 × 10^-3 M.
   1. Write the chemical equation for the dissolving of solid MgF₂ in water.
   2. Calculate the number of moles of MgF_2?that dissolved.
   3. Determine the value of the solubility-product constant, K_sp , for MgF_2?at 25°C.
2. ?A beaker contains 500. mL of a solution in which both Ca²⁺(aq) and Ba²⁺(aq) are present at a concentration of 0.10 M at 25°C. A student intends to separate the ions by adding 0.20 M NaF solution one drop at a time from a buret. At 25°C the value of K_sp for CaF₂ is 3.5 × 10^-11; the value of K_sp for BaF₂ is 1.8 × 10^-6.

i. Which salt will precipitate first, CaF_2?or BaF_2?? Justify your answer.

For parts (b)(ii) and (b)(iii) below, assume that the addition of the NaF solution does not significantly affect the total volume of the liquid in the beaker.

ii. Calculate the minimum concentration of F(aq) necessary to initiate precipitation of the salt selected in part (b)(i).

iii. Calculate the minimum volume of 0.20 M NaF that must be added to the beaker to initiate precipitation of the salt selected in part (b)(i).

1. There are several ways to dissolve salts that have limited solubility. Describe one procedure to redissolve the precipitate formed in part (b).

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