1 CHEMISTRY 150 April 2013 Dr. B. MacLean NAME: (please print) ___________________________________ ID #: ___________________________________ This is a three hour exam. Read over the entire exam before beginning, and begin by doing those questions which you find easiest. Ration your time according to the value of each question. There should be 16 pages in this exam (including this page). If your exam copy does not have 16 pages, notify me immediately. Answer all parts of this exam as indicated. For multiple choice questions, use the data card provided and hand this card in with your exam when you are finished. Be sure to indicate your name and ID number on this card and the exam. It is your responsibility to ensure that all of your answers are legible. READ ALL QUESTIONS CAREFULLY Questions Out of A1-30 30 B1 6 B2 4 B3 5 B4 12 B5 14 B6 5 B7 14 B8 10 TOTAL ____________ 100
16
Embed
CHEMISTRY 150 - StFXpeople.stfx.ca/bjmaclea/chem 150/Midterm/April 2013 Final Exam C… · Answer all parts of this exam as indicated. For multiple choice questions, use the data
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
1
CHEMISTRY 150
April 2013 Dr. B. MacLean NAME: (please print) ___________________________________ ID #: ___________________________________
This is a three hour exam.
Read over the entire exam before beginning, and begin by doing those questions which you find easiest. Ration your time according to the value of each question.
There should be 16 pages in this exam (including this page). If your exam copy does not have 16 pages, notify me immediately.
Answer all parts of this exam as indicated. For multiple choice questions, use the data card provided and hand this card in with your exam when you are finished. Be sure to indicate your name and ID number on this card and the exam. It is your responsibility to ensure that all of your answers are legible.
READ ALL QUESTIONS CAREFULLY
Questions Out of
A1-30 30
B1 6
B2 4
B3 5
B4 12
B5 14
B6 5
B7 14
B8 10
TOTAL ____________ 100
2
Section A: Multiple choice - 30 points (1 each): Answer each of the following multiple choice questions on the
computer card provided by shading the letter (a, b, c, or d) that corresponds to the best response in each case.
1) Which of the following compounds would not be considered to be an organic compound?
a) ammonia
b) methane
c) aspirin (ASA)
d) urea ((NH2)2CO)
2) The alpha particle emitted by some radioactive nuclei is identical to the nucleus of a ____________________
atom.
a) hydrogen
b) helium
c) carbon
d) deuterium
3) In terms of the kinds (or types) of organic reactions, alkenes and alkynes undergo mainly
____________________ type reactions, while aromatic compounds undergo mainly ____________________
type reactions.
a) condensation; elimination
b) elimination; substitution
c) addition; condensation
d) addition; substitution
4) Which of the following should possess the highest boiling point?
a) 1,2-ethane diol
b) ethanol
c) 1,2,3-propane triol
d) 2-pentanol
3
5) Which of the following types of compounds does not possess an acyl group?
a) alcohol
b) amide
c) ketone
d) ester
6) _______________ are commonly incorporated into perfumes and flavorings.
a) thioethers
b) mercaptans
c) esters
d) alkanes
7) For molecules that possess similar molecular weights, the proper ordering of boiling points (lowest
highest) would be:
a) alcohol, alkane, aldehyde, amine
b) alkane, amine, aldehyde, alcohol
c) amine, alkane, alcohol, aldehyde
d) alkane, aldehyde, amine, alcohol
8) Which of the following compounds would be expected to be the most basic?
a) ethanamide
b) dimethylamine
c) ethanoate ion
d) ethanol
4
9) Which of the following compounds would represent a “free-base” structure?
a)
b)
c)
d)
10) What kind of constitutional isomerism is possible for alkanes?
a) skeletal
b) positional
c) functional group
d) cis-/trans-
11) The following reaction is known as a:
a) saponification
b) esterification
c) amidification
d) dehydration
12) Which of the following acid/base combinations could be used to create a buffer mixture?
a) HCl/NaCl
b) HC2H3O2/NH3
c) HC2H3O3/NaOH
d) NH3/NH4Cl
Cl-
.HCla) b)
c) d)
K+
KOH
H2O
5
13) The reason that two alkenes having the same formula may be stereoisomers is that
a) they possess a bond between the two double bond carbons
b) -bonds do not allow for free-rotation between two atoms
c) sigma bonds do not allow for free-rotation between two atoms
d) double bonds consist of two bonds which do not permit twisting
14) One requirement for a carbon atom to be a chiral center is that it must be
a) sp hybridized
b) sp2 hybridized
c) sp3 hybridized
d) involved in a multiple bond
15) Which of the following molecules is chiral?
a) 1-butanol
b) 2-butanol
c) benzene
d) 1-bromopropane
16) From the following list of structures, which one is a hydrocarbon?
a) butanone
b) butyne
c) butanoic acid
d) 2-chloropropane
17) Which of the following compounds would be a carbohydrate?
a)
b)
c)
d)
a) b)
c) d)
6
18) The neurotransmitters Dopamine and Serotonin are examples of
a) amines
b) amides
c) esters
d) alcohols
19) Which of the following species would be a radical?
a) OH-
b) OH
c) H2O
d) H3O+
20) When some salt is dissolved into water, it is found that the pH of the solution is neutral. Which of the
following salts might have been dissolved to create this solution?
a) NaF
b) NH4Cl
c) NaBr
d) KC2H3O2
21) Which of the following functional groups cannot form part of a ring in a heterocyclic compound?
a) ester
b) aldehyde
c) amide
d) ether
22) Which of the following structures represents an amino acid?
a)
b)
c)
d)
a) b)
c) d)
7
23) Which of the following compounds is capable of H-bonding to other molecules like itself?
a) ethers
b) alkanes
c) ketones
d) carboxylic acids
24) Which species shown would be expected to exhibit the greatest water-solubility?
a) hexanoic acid
b) sodium hexanoate
c) hexane
d) hexanol
25) Which of the following acid ionization constants corresponds to the weakest acid?
a) Ka = 1.5 x 10-6
b) Ka = 1.0 x 10-6
c) Ka = 2.0 x 10-3
d) Ka = 1.5 x 10-2
26) Which of the following pKa values describes the strongest acid?
a) pKa = 4.0
b) pKa = 10.0
c) pKa = 2.5
d) pKa = 1.0
8
27) The structure shown on the right is a
a) primary amine
b) secondary amine
c) tertiary amine
d) quaternary amine
28) The empirical formula for an alkyne would be
a) CnH2n
b) CnH2n-2
c) CnH2n-4
d) CnH2n+2
29) Combustion of an alcohol would be expected to yield
a) CO2 and O2
b) CH4 and CO2
c) CO2 and H2O
d) O2 and CH4
30) Two or more forms of an element which differ only in their numbers of neutrons are called