2012 AP Chemistry化學(xué)真題系列之簡(jiǎn)答題免費(fèi)下載

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2012 AP Chemistry Free-Response Questions Free Download

2012 AP 化學(xué)簡(jiǎn)答題部分免費(fèi)下載

考試時(shí)會(huì)提供花常用的等式與常量

以及化學(xué)元素周期表

此套Section II試卷共6題

每道大題含有不同數(shù)量的小題

共計(jì)時(shí)95分鐘

Part A計(jì)55分鐘，第1-3題各20分

Part B計(jì)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(yù)覽：

Section II, Part A,YOU MAY USE YOUR CALCULATOR FOR PART A可使用計(jì)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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