2017
AP Chemistry
Free-Respon Questions
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AP® CHEMISTRY EQUATIONS AND CONSTANTS Throughout the exam the following symbols have the definitions specified unless otherwi noted.
L, mL = liter(s), milliliter(s) mm Hg = millimeters of mercury
g = gram(s) J, kJ = joule(s), kilojoule(s)
nm =
nanometer(s) V = volt(s)
mole(s)
=
=
atmosphere(s)mol
atm
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小学关联词大全2017 AP ® CHEMISTRY FREE-RESPONSE QUESTIONS
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VMPCHEMISTRY
Section II 7 Questions
Time—1 hour and 45 minutes
YOU MAY USE YOUR CALCULATOR FOR THIS SECTION.
Directions: Questions 1–3 are long free-respon questions that require about 23 minutes each to answer and are worth 10 points each. Questions 4–7 are short free-respon questions that require about 9 minutes each to answer and are worth 4 points each.
Write your respon in the space provided following each question. Examples and equations may be included in your respons where appropriate. For calculations, clearly show the method ud and the steps involved in arriving at your answers. You must show your work to receive credit for your answer. Pay attention to significant figures.
CS 2(g ) + 3 Cl 2(g ) → CCl 4(g ) + S 2Cl 2(g )
痣相大全1. Carbon tetrachloride, CCl 4(g ), can be synthesized according to the reaction reprented above. A chemist runs
栖息读音the reaction at a constant temperature of 120°C in a rigid 25.0 L container.
(a) Chlorine gas, Cl 2(g ), is initially prent in the container at a pressure of 0.40 atm.
(i) How many moles of Cl 2(g ) are in the container?
(ii) How many grams of carbon disulfide, CS 2(g ), are needed to react completely with the Cl 2(g ) ? (b) At 30°C the reaction is thermodynamically favorable, but no reaction is obrved to occur. However, at
120°C, the reaction occurs at an obrvable rate.
(i) Explain how the higher temperature affects the collisions between the reactant molecules so that the
盛开的意思
荷尽已无擎雨盖菊残犹有傲霜枝图书馆长reaction occurs at an obrvable rate at 120°C. (ii) The graph below shows a distribution for the collision energies of reactant molecules at 120°C. Draw
a cond curve on the graph that shows the distribution for the collision energies of reactant molecules at 30°C.产后瘦肚子
