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Midterm

CHE230_2006_exam_1287184686Exam


Department
Chemical Engineering and Applied Chemistry
Course Code
CHE230H1
Professor
All
Study Guide
Midterm

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UNIVERSITY OF TORONTO
FACULTY OF APPLIED SCIENCE AND ENGINEERING
Final Examination April 21, 2006
EDC230S ENVIRONMENTAL CHEMISTRY
Examiner : Prof. G. Evans
Closed Book Exam (2.5 hours).
No aids other than a non-programmable calculator are allowed
ANSWER ALL SEVEN (7) QUESTIONS (4 pages + equation sheet).
Record your final answer in the designated box on the front of the solution
booklet. Question values are given on the front of the solution booklet
Part marks will only be given for rough work on questions 2 through 7 done in the
designated areas of the solution booklet.
CONSTANTS R = 0.08206 L-atm/K-mol = 8.314 J/mol-K, (water) = 1.0 kg/L
Equilibrium constants are relative to standard states of M, bar, and pure solid or liquid
Atomic Masses: Ca: 40, O: 16, H: 1, C: 12, P: 31, Al: 27, S: 32, NA=6.02x1023
1 Multiple choice questions: Please write the letter indicating your answer in the
appropriate box on the front of the exam solution booklet.
i) The properties of organic molecules such as activity coefficient (), water solubility
(Cwsat(L)), and octanol-water partition coefficient (Kow) are related to molecular structure.
A non-polar organic compound with a high molecular weight would typically have:
a) low , low Cwsat(L), and low Kow
b) high , high Cwsat(L), and high Kow
c) high , low Cwsat(L), and high Kow
d) low , high Cwsat(L), and low Kow
e) high , low Cwsat(L), and low Kow
ii) When expressed in units of M, 80 ppm of Ca2+(aq) is equivalent to:
a) 4x10-3 M, b) 2 M, c) 4x10-1 M, d) 2x10-3 M, e) 3.2x10-3 M
iii) Point of zero net charge is:
a) The pE at equilibrium for a system of redox reactions
b) A measure of the ionic strength of a solution
c) The donor atom in a coordination compound
d) The pH at which the cation and anion exchange capacities of a soil are equal
e) A good way to save money
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iv) PM is classified by increasing particle size in the following order:
a) TSP< PM10 < PM2.5< ultrafine particulate matter
b) Ultrafine particulate matter< PM2.5< PM10 < TSP
c) Ultrafine particulate matter <TSP< PM10 < PM2.5
d) PM2.5< ultrafine particulate matter <TSP< PM10
e) PM10 < TSP< PM2.5< ultrafine particulate matter
v) What is the industrial name of C2H3F2Cl?
a) HCFC-141; b)HCFC-232; c) HCFC-2321; d) HCFC-142; e) HCFC-22
vi) The ozone hole in Antarctica appears every spring due to two of the following
processes:
1. chlorine atoms reacting with oxygen atoms
2. inactive chlorine is converted to active chlorine during the winter
3. no O3 being produced all winter
4. photochemical removal of O3 increasing when the sun comes up.
5. nitrogen oxides are scavenged by polar stratospheric clouds
The two dominant processes are:
a) 1 and 2, b) 3 and 4, c) 2 and 5 d) 4 and 5, e) 1 and 3.
vii) The hydroxyl radical plays a key role in the oxidation of unsaturated organic
compounds through the following reaction mechanism:
C2H4 + OH• A
A + B C2H4(OH)O2
C2H4(OH)O2• + NO C2H4(OH)O• + C
The missing species in the mechanising are:
a) A = C2H4OH•, B= O2, C= NO2
b) A = C2H6OH•, B= O3, C= NO2
c) A = C2H5•, B= O2, C= NO2
d) A = C2H3 , B= O2, C= NO3
e) A = C2H3•, B= O3, C= NO3
viii) Which of the following terms describe the same process for bonding to clay?
a) Physical adsorption, inner sphere bonding, reversible bonding
b) physical adsorption, outer sphere bonding, irreversible bonding
c) chemisorption, outer sphere bonding, irreversible bonding
d) ion exchange, outer sphere bonding, reversible bonding
e) ion exchange, inner sphere bonding, irreversible bonding
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