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Unformatted text preview: catalyzed and an uncatalyzed reaction pathway for the
same reaction. Indicate which of the two diagrams represents the catalyzed reaction pathway for the
(ii) Indicate whether you agree or disagree with the statement in the box below. Support your answer with
a short explanation. Adding a catalyst to a reaction mixture adds energy
that causes the reaction to proceed more quickly. © 2006 The College Board. All rights reserved.
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12 2006 AP® CHEMISTRY FREE-RESPONSE QUESTIONS
Answer EITHER Question 7 below OR Question 8 printed on page 14. Only one of these two questions will be
graded. If you start both questions, be sure to cross out the question you do not want graded. The Section II score
weighting for the question you choose is 15 percent.
7. Answer the following questions about the structures of ions that contain only sulfur and fluorine.
(a) The compounds SF4 and BF3 react to form an ionic compound according to the following equation.
SF4 + BF3 → SF3BF4
(i) Draw a complete Lewis structure for the SF3+ cation in SF3BF4 .
(ii) Identify the type of hybridization exhibited by sulfur in the SF3+ cation.
(iii) Identify the geometry of the SF3+ cation that is consistent with the Lewis structure drawn
in part (a)(i).
(iv) Predict whether the F–S–F bond angle in the SF3+ cation is larger than, equal to, or smaller
than 109.5°. Justify your answer.
(b) The compounds SF4 and CsF react to form an ionic compound according to the following equation.
SF4 + CsF → CsSF5
(i) Draw a complete Lewis structure for the SF5− anion in CsSF5 .
(ii) Identify the type of hybridization exhibited by sulfur in the SF5− anion.
(iii) Identify the geometry of the SF5− anion that is consistent with the Lewis structure drawn
in part (b)(i).
(iv) Identify the oxidation number of sulfur in the compound CsSF5 . © 2006 The College Board. All ri...
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- Spring '09