Download CHEM 32-002

CHEM 32-001
FINAL EXAM
NAME: ______________________
MULTIPLE CHOICE QUESTIONS (3 points each)
Write the letter of the correct answer in the space beside the problem. There is only one correct
answer for each question.
_____ 1) One centigram equals:
a) 100 grams
b) 1000 grams
c) 1/100 of a gram
d) 1/1000 of a gram
e) more than one of these answers are correct
_____ 2) Which of the following pairs of elements is most likely to form an ionic bond?
a) F and Cl
b) K and Cl
c) H and Cl
d) Ar and Cl
e) more than one of these answers is correct
_____ 3) H2O is best described as...
a) a nonpolar covalent compound
b) an ionic compound, containing H3O+ and OHc) a polar covalent compound
d) an ionic compound, containing H+ and OHe) an ionic compound, containing two H+ and one O2_____ 4) Which of the following compounds is a weak electrolyte?
a) CaCl2
b) chloromethane
c) formic acid
d) nitrogen
_____ 5) Which of the following compounds will NOT dissolve in water?
a) 1-propanol
b) propanone
c) cyclopropane
d) sodium propanoate
_____ 6) Which of the following would be a reasonable pH for a solution of NaOH?
a) 9.44
b) 7.00
c) 4.18
d) 1.93
e) any of these is reasonable
_____ 7) How do carbon-14 and nitrogen-14 differ?
a) They have different numbers of protons.
b) They have different numbers of neutrons.
c) They have different numbers of electrons.
d) They have different numbers of valence electrons.
e) All of the above answers are correct.
_____ 8) Considering the position of Te (element #52) on the periodic table, which of the
following ions would you expect Te to form?
a) Te+
b) Te2+
c) Te6+
2d) Te
e) Te
f) Te6_____ 9) Alkenes react with water very slowly. However, this reaction goes much faster if
H2SO4 is added. In terms of energy, the H2SO4...
a) makes the activation energy larger
b) makes the activation energy smaller
c) makes the heat of reaction (H) larger
d) makes the heat of reaction smaller
e) more than one of these answers are correct
Chem 32-Final Exam
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_____ 10) Which of the following produces the primary structure of a protein?
a) disulfide bridges between cysteines.
b) the formation of an amide from the amino and acid groups of two amino acids
c) hydrogen-bonding between oxygen and hydrogen from different peptide groups
d) the attraction of the polar amino acid side chains to the surrounding water
e) more than one of these
_____ 11) 1.3% NaHCO3 is isotonic with blood serum. Therefore...
a) 2% NaHCO3 is hypertonic and causes crenation.
b) 2% NaHCO3 is hypertonic and causes hemolysis.
c) 2% NaHCO3 is hypotonic and causes crenation.
d) 2% NaHCO3 is hypotonic and causes hemolysis.
_____ 12) Beta-oxidation is an important step in the metabolism of...
a) fatty acids
b) amino acids
c) monosaccharides
d) all of these
_____ 13) Oleic acid is a fatty acid with the formula C18H34O2. During the metabolism of one
molecule of oleic acid, how many molecules of acetyl-coenzyme A are formed?
a) 2
b) 9
c) 18
d) 34
e) 146
_____ 14) You have a solution of potassium formate (KCHO2). What other chemical must be in
this solution in order for it to function as a buffer?
a) HCHO2
b) NaCHO2
c) H2CO3
d) NaOH
e) NaHCO3
_____ 15) Which of the following is the primary structural material in plants?
a) cellulose
b) glycogen
c) amylose
d) amylopectin
e) none of these
f) all of these
_____ 16) Which of the following molecules contains a chiral carbon atom?
a) pentane
b) 2-chloropentane
c) 3-chloropentane
d) cyclopentane
e) none of these
_____ 17) During the breakdown of the amino acid leucine, two molecules of FADH2 are
formed. The electron transport chain then uses these 2 FADH2 to make...
a) 2 ATP
b) 3 ATP
c) 4 ATP
d) 5 ATP
e) none of these
_____ 18) Which of the following is an example of a frame shift mutation?
a) The wrong DNA chain is transcribed
b) One of the two chains of DNA shifts up one base with respect to the other chain
c) An extra base is inserted into a strand of DNA
d) One base in a DNA strand is replaced by another
e) Both c and d are frame shift mutations
_____ 19) One mole of methane weighs approximately:
a) 10 g
b) 15 g
c) 16 g
d) 28 g
e) 29 g
f) 30 g
Chem 32-Final Exam
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_____ 20) When a piece of wood burns...
a) potential energy is converted into kinetic energy.
b) kinetic energy is converted into potential energy.
c) heat is converted into work.
d) work is converted into heat.
_____ 21) Which of the following bonds to a single amino acid during translation?
a) DNA
b) ATP
c) messenger RNA
d) ribosomal RNA
e) transfer RNA
PROBLEMS: Be sure to show your work wherever there is work to show!
1) (6 points) List one function of each of the following types of compounds in humans. Do not
write the same answer more than once: list a different function for each compound!
a) proteins
b) triglycerides
c) nucleic acids
2) (8 points) Name each of the following substances:
K _________________________
Fe _________________________
I _________________________
NH4+ _________________________
3) (8 points) Write the chemical formulas of each of the following substances:
copper __________
magnesium __________
phosphate ion __________
sulfide ion __________
Chem 32-Final Exam
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4) (4 points) A pen is 12.3 centimeters long. How long is this in inches? (Possibly helpful fact:
one inch = 2.54 centimeters.)
5) (7 points) Chloroform (CHCl3) is an important industrial chemical: it also has been used as a
cleaning solvent and as a general anesthetic. It is manufactured by the following reaction:
3 Cl2 + CH4  CHCl3 + 3 HCl
If you allow 100 grams of CH4 to react with Cl2, how many grams of HCl will you make?
7) (4 points) Write a balanced equation for the acid-base reaction that occurs when a solution that
contains HCO3– ions is mixed with a solution that contains OH– ions
Chem 32-Final Exam
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6) (5 points) When CO2 is dissolved in water, the pH of the resulting solution is lower than 7.
Explain this observation clearly and completely.
8) (8 points) Name the following compounds. You may use any naming system that is in the
textbook.
CH3
CH3
CH2
C
CH3
CH2
CH2
O
CH2
CH3
O
CH3
CH2
NH
CH2
CH3
CH3
C
H
9) (6 points) Draw the structure of each of the following:
a) an isomer of diethyl ether.
b) an amide which contains exactly two carbon atoms (and no other functional group).
Chem 32-Final Exam
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10) (10 points) Draw the structures of each of the following compounds. You many use any type
of structure that is used in the textbook.
pentanoic acid
acetone
phenol
1-hexene
11) (12 points) Draw the structures of the products of each of the following reactions.
O
CH3
CH2
CH2
C
OH
+ NaOH
O
[H]
H
C
CH2
(reduction)
OH
CH3
CH
CH2
CH
CH2
+ H2 O
CH3
+ H2 O
H+
O
CH3
CH2
NH
C
(hydrolysis)
Chem 32-Final Exam
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12) (6 points) Stearic acid is a saturated fatty acid that contains 18 carbon atoms.
a) Draw the structure of the triglyceride that contains 3 molecules of stearic acid.
b) Is this triglyceride a solid, a liquid, or a gas at room temperature? Circle the correct
choice.
13) (5 points) Starch is made up of two different polysaccharides: amylose and amylopectin.
How are their chemical structures different from one another?
14) (6 points) Describe the lipid bilayer that forms the cell membrane in animals. Be sure to
include the types of compounds that form the bilayer. (A picture will be helpful.)
Chem 32-Final Exam
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15) (3 points) Draw the structure of the amino acid threonine as it would appear in a highly basic
solution. The side chain of threonine is shown on the cover sheet of this test. (You can get part
credit for drawing the structure of threonine at neutral pH.)
16) (5 points) If you want to heat a 1200 gram copper pan from 20˚C to 100˚C, you will need to
use 8200 calories of heat. From this information, calculate the specific heat of copper.
17) (5 points) Write the balanced equation for the combustion of cyclopentane.
Chem 32-Final Exam
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18) (8 points) A coding strand of DNA contains the base sequence AGAGCGACG. If this is the
DNA code for a polypeptide, would you expect this polypeptide to be soluble in water? Explain
your reasoning clearly.
19) (6 points) Describe the function of each of the following substances in a living cell:
a) ATP (adenosine triphosphate)
b) NAD+ (nicotinamide adenine dinucleotide)
Chem 32-Final Exam
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20) (6 points) You need to make 250 mL of 0.35 M K2SO4 solution. How many grams of K2SO4
will you need?
21) (5 points) You have a bottle that contains 5% NaCl. You need to make 100 mL of 0.9%
NaCl. Describe how you would make this solution, including specific quantities where
appropriate.
Chem 32-Final Exam
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22) (4 points) A protein can be denatured by changing the pH of its environment. List two other
ways to denature a protein.
BONUS PROBLEM: 10 points possible ("Wow!!! Extra credit!!!!")
Natural gas contains ethane, which burns according to the following equation:
2 C2H6 + 7 O2  4 CO2 + 6 H2O + 745 kcal
How many grams of ethane would you need to burn to give you enough energy to heat 500
moles of water from 20˚C (room temperature) to 100˚C (the boiling point of water)?