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# CHhmwk9 - moore(jwm2685 Homework 9 vanden bout(51640 This...

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moore (jwm2685) – Homework 9 – vanden bout – (51640) 1 This print-out should have 38 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points If the average rate of formation of H 2 (g) is 3 . 90 (mol H 2 ) / L / s for the reaction 2 PH 3 (g) 2 P(g) + 3 H 2 (g) , what is the unique average reaction rate? 1. 11 . 7 mol / L / s 2. 3 . 90 mol / L / s 3. 1 . 30 mol / L / s correct 4. 2 . 60 mol / L / s 5. 7 . 80 mol / L / s Explanation: 002 10.0points Consider the reaction 2 NO 2 (g) + F 2 (g) 2 NO 2 F(g) rate = - Δ[F 2 ] Δ t . What is another form of the rate of the reaction? 1. Δ[NO 2 F] 2 Δ t correct 2. Δ[NO 2 F] Δ t 3. - Δ[NO 2 ] Δ t 4. - 2 Δ[NO 2 ] Δ t 5. Δ[NO 2 ] 2 Δ t Explanation: 003 10.0points Consider the concentration-time dependence graph for a first-order reaction. [A] 0 Molar Concentration of Reactant A B C Concentration -→ Time -→ At which point on the curve is the reaction fastest? 1. A + t 1 / 2 2. C 3. A correct 4. The rates are the same at all points. 5. B Explanation: Steeper portions of the graph define faster reactions. 004 10.0points Consider the concentration-time dependence as shown below for two first order reactions. [A] 0 Molar Concentration of Reactant Concentration -→ Time -→

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moore (jwm2685) – Homework 9 – vanden bout – (51640) 2 Which reaction has the greatest t 1 / 2 ? 1. the reaction represented by the upper curve correct 2. Unable to determine 3. the reaction represented by the lower curve Explanation: 005 10.0points When the reaction 3 NO(g) N 2 O(g) + NO 2 (g) is proceeding under conditions such that 0.015 mol/L of N 2 O is being formed each second, the rate of the overall reaction is ? and the rate of change for NO is ? . 1. 0.015 M · s 1 ; - 0.045 M · s 1 correct 2. 0.030 M · s 1 ; - 0.005 M · s 1 3. 0.015 M · s 1 ; - 0.005 M · s 1 4. 0.015 M · s 1 ; +0.045 M · s 1 5. none of the other answers is correct Explanation: Notice that three moles of NO are required to make one mole of N 2 O in this reaction, so the rate of disappearance of NO (which has a negative sign) is three times the rate of appearance of N 2 O. 006 10.0points The overall reaction: 2 O 3 ( g ) -→ 3 O 2 ( g ) has an empirically determined rate law with a single unimolecular event. If k = 4 . 0 × 10 5 M 1 · s 1 , [O 3 ] = 0.5 M and [O 2 ] = 0.2 M, what is the observed rate? 1. 4 . 0 × 10 3 M · s 1 2. 2 . 0 × 10 5 M · s 1 correct 3. 4 . 0 × 10 4 M · s 1 4. 2 . 0 × 10 4 M · s 1 Explanation: rate = k · [O 3 ] = 4 . 0 × 10 5 M 1 · s 1 · 0 . 5 = 2 . 0 × 10 5 M 1 007 10.0points What is the rate law for the reaction A + B + C D if the following data were collected? Exp [A] 0 [B] 0 [C] 0 Initial Rate 1 0.4 1.2 0.7 2 . 32 × 10 3 2 1.3 1.2 0.9 7 . 54 × 10 3 3 0.4 4.1 0.8 9 . 25 × 10 2 4 1.3 1.2 0.2 7 . 54 × 10 3 1. rate = 4 . 48 × 10 3 [A] 1 [B] 2 [C] 1 2. rate = 5 . 37 × 10 3 [A] 1 [B] 3 [C] 0 3. rate = 3 . 36 × 10 3 [A] 1 [B] 3 [C] 0 correct 4. rate = 1 . 49 × 10 3 [A] 0 [B] 3 [C] 1 5. rate = 1 . 79 × 10 3 [A] 0 [B] 2 [C] 1 Explanation: 008 10.0points Consider the reaction 4 Fe 2+ (aq) + O 2 (aq) + 2 H 2 O( ) 4 Fe 3+ (aq) + 4 OH (aq) rate = k [Fe 2+ ][OH ] 2 [O 2 ] .
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CHhmwk9 - moore(jwm2685 Homework 9 vanden bout(51640 This...

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