Practice Exam III with answers

Practice Exam III with answers - General Chemistry II Exam...

Info iconThis preview shows pages 1–4. 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

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: General Chemistry II Exam III, 100 Points McCallum You have 80 minutes to complete this exam. You may use a calculator, 3 5 card, and the provided periodic table and equation sheet. Please box or otherwise indicate answers clearly. Ambiguous or unreadable work will not be graded. Read the questions carefully!! To be used only if you request a re-grade or grading correction: I wish to turn in this exam in for a possible re-grade. I have attached a note to indicate where I think the mistake was. I have not altered or added to my original answer in any way. I understand that altering an exam for a re-grade is considered cheating and will result in being reported to the Dean of Student Life for disciplinary action in addition to a grade of F for the course. (signed) Date Name: Student I.D.: Name: Student No.: 2 Multiple Choice questions. 50 Points Choose the best answer from the list of choices. Use your scantron sheet and mark each answer clearly. Be sure to fully erase all changes. 1. Consider the reaction 2H 2 + O 2- 2H 2 O. What is the ratio of the initial rate of the appearance of water to the initial rate of disappearance of oxygen? (a) 1:1 (b) 2:1 (c) 1:2 (d) 2:2 (e) 3:2 2. Consider the rate law R = k [ A ] n [ B ] m . How are the exponents n and m determined? (a) By using the balanced chemical equation. (b) By using the subscripts for the chemical formulas. (c) By using the coefficients of the chemical formulas. (d) By educated guesses. (e) By experiment. 3. A general reaction written as 2A + 2B- C + 2D is studied and yields the following data: [ A ] [ B ] Initial [ C ] / t 0.100 M 0.100 M 0.000040 mol / L s 0.200 M 0.100 M 0.000160 mol / L s 0.100 M 0.200 M 0.000040 mol / L s What is the order of the reaction with respect to B? (a) 1 (b) 4 (c) 3 (d) 2 (e) 4. Referring to question (3), above, what is the order with respect to A? (a) 1 (b) 4 (c) 3 (d) 2 (e) 5. Referring to question (3), above, what are the proper units for the rate constant for the reaction? (a) s- 1 (b) mol L- 1 s- 1 (c) L mol- 1 s- 1 (d) L 3 mol- 3 s- 1 (e) L 2 mol- 2 s- 1 Name: Student No.: 3 6. The OH radical disproportionates according the the elementary chemical reaction OH + OH- H 2 O + O. This reaction is second order in OH. The rate constant for the reaction is 2 . 10- 12 cm 3 / molecule s at room temperature. If the initial OH concentration is 1 . 10 13 molecules / cm 3 , what is the first half-life of the reaction? (a) 20 s (b) 2 . 10- 3 s (c) . 050 s (d) 0.035 s (e) 12 s 7. In 6 M HCl, the complex ion Ru ( NH 3 ) 3 + 6 decomposes to a variety of products. The reaction is first order in Ru ( NH 3 ) 3 + 6 , and has a half-life of 14 hours at 25 C. Under these conditions, how long will it take for the Ru ( NH 3 ) 3 + 6 to decrease to 12.5% of its initial value?...
View Full Document

Page1 / 19

Practice Exam III with answers - General Chemistry II Exam...

This preview shows document pages 1 - 4. Sign up to view the full document.

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