2017年AP化学（选择题+简答题）真题及答案下载（PDF）

2017年AP化学（选择题+简答题）真题及答案下载（PDF）

以下为2017年AP化学选择题真题：

1）The mass spectrum of an average sample of a pure element is shown in the figure above. Which of the following is the identity of the element?

A.Y

B.Zr

C.Nb

D.Th

2)The ideal gas law best describes the properties of which of the following gases at 0°C and 1 atm?

A.PH₃

B.HBr

C.SO₂

D.N₂

3)At 298 K and 1 atm, Br₂ is a liquid with a high vapor pressure, and Cl₂ is a gas. Those observations provide evidence that under the given conditions, the

A.forces among Br₂ molecules are stronger than those among Cl₂ molecules

B.forces among Cl₂ molecules are stronger than the Cl−Cl bond

C.Br−Br bond is stronger than the Cl−Cl bond

D.Cl−Cl bond is stronger than the Br−Br bond

4) Which of the following has the bonds arranged in order of decreasing polarity?

A.H−F > N−F > F−F

B.H−I > H−Br > H−F

C.O−N > O−S > O−Te

D.Sb−I > Sb−Te > Sb−Cl

余下2017年AP化学选择题真题及答案省略！

以下为2017年AP化学简答题真题：

CS2(g) + 3Cl2(g)  → CCl4(g) + S2Cl2(g)

1.  Carbon tetrachloride, CCl4(g) , can be synthesized according to the reaction represented above. A chemist runs the reaction at a constant temperature of 120C in a rigid 25.0 L container.

(a)  Chlorine gas, Cl2(g) ,  is initially present in the container at a pressure of 0.40 atm.

• (i)  How many moles of Cl2(g) are in the container?
• (ii)  How many grams of carbon disulfide, CS2(g) , are needed to react completely with the Cl2(g) ?

(b)  At 30℃ the reaction is thermodynamically favorable, but no reaction is observed to occur. However, at 120℃, the reaction occurs at an observable rate.

• (i)  Explain how the higher temperature affects the collisions between the reactant molecules so that the reaction occurs at an observable rate at 120℃.
• (ii)  The graph below shows a distribution for the collision energies of reactant molecules at 120℃. Draw a second curve on the graph that shows the distribution for the collision energies of  reactant molecules at 30℃.

(c)  S2Cl2  is a product of the reaction.

• (i)  In the box below, complete the Lewis electron-dot diagram for the S2Cl2  molecule by drawing in all of the electron pairs.

• (ii)  What is the approximate value of the Cl-S-S bond angle in the S2Cl2  molecule that you drew in part (c)(i) ? (If the two Cl-S-S bond angles are not equal, include both angles.)

(d)  CCl4(g) can also be produced by reacting CHCl3(g) with Cl2(g) at 400°C, as represented by the equation below.

CHCl3(g) + Cl2(g)  →  CCl4(g) + HCl(g)

At the completion of the reaction a chemist successfully separates the CCl4(g) from the HCl(g) by cooling the mixture to 70℃, at which temperature the CCl4(g) condenses while the HCl(g) remains in the gaseous state.

• (i)  Identify all types of intermolecular forces present in HCl(l).
• (ii)  What can be inferred about the relative strengths of the intermolecular forces in  CCl4(l)  and  HCl(l) ? in terms of the information above.

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