HW 11 Solutions - Wright, Jacqueline Homework 11 Due: Dec 5...

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

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Wright, Jacqueline Homework 11 Due: Dec 5 2007, 11:00 pm Inst: James Holcombe 1 This print-out should have 28 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points For a reaction that is zero-order overall, 1. the activation energy is zero. 2. the rate constant is zero. 3. the rate does not change during the reac- tion. correct 4. the reactant concentration does not change with time. Explanation: Remember that for a zero order reaction, the reactant is still used up; its concentration will decrease as time passes, but the rate will not be affected. If you double or triple the concentration of that reactant, the rate will not change for a zero order reaction. 002 (part 1 of 1) 10 points The rate of the reaction 2O 3 3O 2 is equal to 1.- [O 2 ] t . 2.- 1 2 [O 3 ] t . correct 3.- [O 3 ] t . 4.- 1 3 [O 2 ] t . 5. + 1 2 [O 3 ] t . Explanation: The rate of a chemical reaction can either be expressed as the rate of disappearance of a reactant (as in this case) or as the rate of appearance of a product. However, this rate is multiplied by the inverse of the coef- ficient of the species in question. The nega- tive sign here reminds us that as the reaction progresses, this species is consumed and de- creases in concentration. 003 (part 1 of 1) 10 points When we speak of the rate of a reaction, we are referring to 1. the maximum rate. 2. the instantaneous rate. correct 3. the average rate. 4. the minimum rate. 5. the integrated rate. Explanation: Reaction rate varies as a reaction pro- gresses, slowing down as the amount of re- actant decreases. The instantaneous rate is the rate at a particular time. 004 (part 1 of 1) 10 points Consider the elementary reaction H + Br 2 HBr + Br The rate of production of HBr would be reliably aproximated as simple first order if 1. first order will never be a good approxi- mation. 2. [H] is large and [Br 2 ] is large. 3. [H] and [Br 2 ] are about equal. 4. [H] is small and [Br 2 ] is small. 5. [H] is small and [Br 2 ] is large. correct Explanation: The very small amount of H will be con- tinuously used up, displacing one of the Br atoms and forming HBr. Wright, Jacqueline Homework 11 Due: Dec 5 2007, 11:00 pm Inst: James Holcombe 2 005 (part 1 of 1) 10 points Consider the reaction 2NO 2 (g) + F 2 (g) 2NO 2 F(g) rate =- [F 2 ] t . What is another form of the rate of the reaction? 1. [NO 2 ] 2 t 2. [NO 2 F] 2 t correct 3. [NO 2 F] t 4.- [NO 2 ] t 5.- 2[NO 2 ] t Explanation: 006 (part 1 of 1) 10 points For the reaction 2NO(g) + 2H 2 (g) N 2 (g) + 2H 2 O(g) the following data were collected....
View Full Document

Page1 / 9

HW 11 Solutions - Wright, Jacqueline Homework 11 Due: Dec 5...

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