2009 AP Chemistry化學(xué)真題系列之簡(jiǎn)答題免費(fèi)下載

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2009 AP Chemistry Free-Response Questions Free Download

2009 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

完整版下載鏈接見(jiàn)文末

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）Answer the following questions that relate to the chemistry of halogen oxoacids.

1. Use the information in the table below to answer part (a)(i).
   1. Which of the two acids is stronger, HOCl or HOBr ? Justify your answer in terms of K_a .
   2. Draw a complete Lewis electron-dot diagram for the acid that you identified in part (a)(i).
   3. Hypoiodous acid has the formula HOI. Predict whether HOI is a stronger acid or a weaker acid than the acid that you identified in part (a)(i). Justify your prediction in terms of chemical bonding.
2. Write the equation for the reaction that occurs between hypochlorous acid and water.
3. A 1.2 M NaOCl solution is prepared by dissolving solid NaOCl in distilled water at 298 K. The hydrolysis reaction?occurs.
   1. Write the equilibrium-constant expression for the hydrolysis reaction that occurs between OCl^-(aq) and H₂O(l) .
   2. Calculate the value of the equilibrium constant at 298 K for the hydrolysis reaction.
   3. Calculate the value of [OH^-] in the 1.2 M NaOCl solution at 298 K .
4. A buffer solution is prepared by dissolving some solid NaOCl in a solution of HOCl at 298 K. The pH of the buffer solution is determined to be 6.48.
   1. Calculate the value of [H3O⁺] in the buffer solution.
   2. Indicate which of HOCl(aq) or OCl^?(aq) is present at the higher concentration in the buffer solution. Support your answer with a calculation.

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