EXAM 4 - Mantooth, Marlo Homework 2 Due: Feb 14 2007, 11:00...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Mantooth, Marlo – Homework 2 – Due: Feb 14 2007, 11:00 pm – Inst: Donna C Lyon 1 This print-out should have 34 questions. Multiple-choice questions may continue on the next column or page – fnd all choices be±ore answering. The due time is Central time. This HW assignment is due Wednesday, February 14, by 11:00PM. 001 (part 1 o± 1) 10 points Consider the reaction 2 NO 2 (g) + F 2 (g) 2 NO 2 F(g) rate = - Δ[F 2 ] Δ t . What is another ±orm o± the rate o± the reaction? 1. - 2 Δ[NO 2 ] Δ t 2. Δ[NO 2 F] Δ t 3. Δ[NO 2 F] 2 Δ t correct 4. - Δ[NO 2 ] Δ t 5. Δ[NO 2 ] 2 Δ t Explanation: 002 (part 1 o± 1) 10 points Under certain conditions, the reaction 3 A + 4 B 7 C was observed to proceed at a rate 0 . 0372 M · s - 1 . What was the correspond- ing rate o± change in reactant B? 1. - 0 . 0124 M · s - 1 2. 0 . 0093 M · s - 1 3. - 0 . 0372 M · s - 1 4. 0 . 1116 M · s - 1 5. - 0 . 1488 M · s - 1 correct 6. - 0 . 0093 M · s - 1 7. - 0 . 1116 M · s - 1 8. 0 . 0124 M · s - 1 9. 0 . 1488 M · s - 1 10. 0 . 0372 M · s - 1 Explanation: Reactant B is reacting at 4 times the stated rate o± the overall reaction. B is also a reac- tant, so the concentration is DECREASING with time, which corresponds to a NEGA- TIVE rate. 003 (part 1 o± 1) 10 points When we speak o± the rate o± a reaction, we are re±erring to 1. the minimum rate. 2. the integrated rate. 3. the average rate. 4. the maximum rate. 5. the instantaneous rate. correct Explanation: Reaction rate varies as a reaction pro- gresses, slowing down as the amount o± re- actant decreases. The instantaneous rate is the rate at a particular time. 004 (part 1 o± 3) 10 points Manganate ions (MnO 2 - 4 ) react at 2.0 mol L · min in acidic solution to ±orm per- manganate ions and manganese(IV) oxide: 3 MnO 2 - 4 (aq) + 4 H + (aq) 2 MnO - 4 (aq) + MnO 2 (s) + 2 H 2 O( ) What is the rate o± ±ormation o± perman- ganate ions? 1. 1 . 3 mol L · min correct
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Mantooth, Marlo – Homework 2 – Due: Feb 14 2007, 11:00 pm – Inst: Donna C Lyon 2 2. 1 . 8 mol L · min 3. 10 . 8 mol L · min 4. 0 . 9 mol L · min 5. 5 . 4 mol L · min Explanation: rate of formation of MnO - 4 = ˆ 2 . 0 mol MnO 2 - 4 L · min 2 mol MnO - 4 3 mol MnO 2 - 4 ! = 1 . 33333 mol L · min 005 (part 2 of 3) 10 points What is the rate of reaction of H + (aq)? 1. 2 . 7 mol L · min correct 2. 0 . 9 mol L · min 3. 1 . 8 mol L · min 4. 5 . 4 mol L · min 5. 10 . 8 mol L · min Explanation: rate of reaction of H + (aq) = ˆ 2 . 0 mol MnO 2 - 4 L · min 4 mol H + 3 mol MnO 2 - 4 ! = 2 . 66667 mol L · min 006 (part 3 of 3) 10 points What is the unique rate of the reaction? 1. 1 . 8 mol L · min 2. 5 . 4 mol L · min 3. 0 . 67 mol L · min correct 4. 2 . 7 mol L · min 5. 0 . 9 mol L · min Explanation: The overall reaction proceeds at 1 3 the rate of manganate ion depletion: 1 3 × µ 2 . 0 mol
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/12/2011 for the course GOV 365L taught by Professor Liu during the Spring '08 term at University of Texas at Austin.

Page1 / 9

EXAM 4 - Mantooth, Marlo Homework 2 Due: Feb 14 2007, 11:00...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online