Solved Questions for Quiz 1 - Environmental Systems Engineering | ENV 4001, Quizzes of Engineering

Download Solved Questions for Quiz 1 - Environmental Systems Engineering | ENV 4001 and more Quizzes Engineering in PDF only on Docsity! ENV 4001: ENVIRONMENTAL SYSTEMS ENGINEERING Spring 2008 University of South Florida Quiz #1 Civil & Environmental Eng. Thursday, February 14 Prof. J.A. Cunningham Instructions: 1. You may read these instructions, but do not turn the page or begin working until instructed to do so. 2. This quiz contains five multiple-choice questions. For each question, circle or clearly indicate the best answer. If your answer is ambiguous, you will not be given credit. 3. You are allowed to use your text book, your course notes, or other printed materials. You may not receive help from another person. 4. A hand-held calculator is recommended. Other electronic devices are not permitted. 5. Time limit: 40 minutes. Stop working when asked. If you continue working after time has been called, you will be penalized at a rate of 1 point per minute. 6. Scoring is as follows: e The maximum number of points possible on this quiz is 40. ¢ You start with 5 points out of 40 just for showing up and writing your name. e If you circle the correct answer to a question, you receive the number of points indicated (+5 for question 1, +7 for questions 2-4, +9 for question 5). e If you leave a question blank, you get 0 points for that question. e If you circle a wrong answer for a question, you receive —1 point for that question. This is to discourage random guessing. 7. Don’t cheat. Cheating will result in appropriate disciplinary action according to university policy. More importantly, cheating indicates a lack of personal integrity. 8. Please print your name legibly in the space provided below, and turn in this quiz at the end of the period. 9. Hints: e Read each question carefully and answer the question that is asked. e Watch your units. If you take good care of your units, they will take good care of you. e If you don’t have time to answer all the questions, don’t worry. Most students will not finish. It is more important to get correct the problems that you do answer. Getting a couple problems right is much better than trying all of them but getting them wrong! Name: ANSWER KEY Version £ pls 1. (5 pts) The following organization(s) is/are responsible for setting Primary and Secondary Standards that apply to the quality of the public (city) drinking water in the City of Tampa: (a) City of Tampa Water Department (b) Hillsborough County Environmental Protection Commission (EPC) Co) United States Environmental Protection Agency >> (d) United States Congress (e) Both (a) and (b) (f) None of the above EPA sets pomery and Secondery Starderds under the Safe Drinking Water Act (7 pts) A beaker of water contains some propionic acid, CH3CH2COOH, dissolved in the water. The following equation describes the dissociation of this acid in water: CIBCIhCOOH € HH + ClyCHb>COO pKa =??? When the pH in the beaker is 5, the concentration of undissociated acid [CH3;CH,COOH] and the concentration of propionate ion [CII;CH2»COO-] are measured. The ratio of dissociated ion to undissociated acid is found to be [CH;CH2COO ]/[CH;CH2»COOH] = 1.35. If the pH is then raised from 5 to 6, what will happen to the ratio of concentrations, [CH3CHCOO |/[{CH3;CH,>COOH]? (a) It will decrease by a factor of 10. (b) It will decrease by about 20%. (c) It will stay the same. (d) It will increase by about 20%. /(e) It will increase by a factor of 10.) (f) This cannot be determined without knowing pKa. [ut }( ca, cs cov] = t (Ors CACoon] _ Ky Cewscuicoo¥y (ea,cr,Coolt] — (H*] Te pk increases fom S te G, ther Cy docrteces Fovm, io to 6° Thos Hew) ‘ineréases by a fectir of 10 p2/s