PORTAGE LEARNING CHEM 210 - MODULE 2
EXAM WITH QUESTIONS AND ANSWERS
The pH of a solution of 8.9 x 10^-12 M NaOH is:
A. 8.9
B. 8.9 x 10^-12
C. 4.8
D. 11
E. 2.9 - ANSWER-2.9
Water is a unique molecule. Which of the following contributes to waters
unique place in the chemical world?
The geometry of the molecule
The polarity of the O-H bonds
The ability of water molecules to hydrogen bond
The bond angle of water
All of the above are correct - ANSWER-All of the above are correct
What factor contributes to the bench shape of a water molecule? -
ANSWER-The unshared electron pairs on the oxygen atom
The H+ concentration of a solution is 6.7 x 10^-12. What is the pH? -
ANSWER-11.17 ( pH= log[6.7 x10-12] = 11.17)
If the KA of an acid is 2.67 x 10-5, what is the pKa? - ANSWER-4.57 (
pKa= -log(2.67x10-5)= 4.57)
Elemental iodine is a solid at room temperature. What is the dominant
attractive force that exists between I2 molecules in a solid? - ANSWER-
London forces
Which one of the following molecules can form a hydrogen bond?
HBr
HCl
NH3
CH4
H2 - ANSWER-NH3
, PORTAGE LEARNING CHEM 210 - MODULE 2
EXAM WITH QUESTIONS AND ANSWERS
A hydrogen bond conform between hydrogen bond to oxygen and -
ANSWER-Nitrogen
What is the equilibrium, constant expression? - ANSWER-Ka =
[products]/[reactants]
Which buffer system is used by the renal system to maintain pH balance? -
ANSWER-bicarbonate buffer system
A buffer can neutralize only a certain amount of acid and base. We say that
this is it's: - ANSWER-Buffer capacity
The ion product is equal to what value? - ANSWER-1.0 x 10-14
In the equilibrium, constant expressions, the double brackets [ ] indicate: -
ANSWER-Concentration in molarity
A pH = 5.0 indicates a concentration of OH- (in M) of __________.
A. 5
B. 10-5
C. 10-9
D. 10-1
E. 101 - ANSWER-C. 10^-9
The hybrid of the central atom in water is _____ - ANSWER-Sp3
True or False: the amino acids serine and methionine both contain sulfur
atoms - ANSWER-False
True or false: the side chain of histidine is bonded to the backbone nitrogen
atom - ANSWER-False
True or false: the name of the molecule that binds to an enzyme is called
the holoenzyme - ANSWER-False
, PORTAGE LEARNING CHEM 210 - MODULE 2
EXAM WITH QUESTIONS AND ANSWERS
True or False: an inhibitor that binds at the active site is a non competitive
inhibitor - ANSWER-False
Which amino acids both have an R group (side chain) with an OH
functional group? - ANSWER-Ser and Thr
The formation of a peptide bond between two amino acids is an example of
an _______ reaction - ANSWER-Water-forming
The peptide Ala-Glu-Gly-Ala-Leu-Arg has _____ - ANSWER-Five peptide
bonds
Formally, when there are 99 or fewer amino acids are covalently linked
together that is called a _________. - ANSWER-Polypeptide
All of the 20 standard amino acids contain an R-group that is attached to
the:
A) α carbon
B) Carboxyl group
C) Amino group
D) β carbon
E) None of the above - ANSWER-A. α carbon
Which of the following correctly matches the amino acids with its one letter
abbreviation - ANSWER-Lysine,K
The order of amino acids in a protein is written ______. - ANSWER-N to C
terminus
Roughly how many amino acids are there in one turn of an α helix?
A) 1
B) 2.8
C) 3.6
D) 4.2
E) 10 - ANSWER-3.6
EXAM WITH QUESTIONS AND ANSWERS
The pH of a solution of 8.9 x 10^-12 M NaOH is:
A. 8.9
B. 8.9 x 10^-12
C. 4.8
D. 11
E. 2.9 - ANSWER-2.9
Water is a unique molecule. Which of the following contributes to waters
unique place in the chemical world?
The geometry of the molecule
The polarity of the O-H bonds
The ability of water molecules to hydrogen bond
The bond angle of water
All of the above are correct - ANSWER-All of the above are correct
What factor contributes to the bench shape of a water molecule? -
ANSWER-The unshared electron pairs on the oxygen atom
The H+ concentration of a solution is 6.7 x 10^-12. What is the pH? -
ANSWER-11.17 ( pH= log[6.7 x10-12] = 11.17)
If the KA of an acid is 2.67 x 10-5, what is the pKa? - ANSWER-4.57 (
pKa= -log(2.67x10-5)= 4.57)
Elemental iodine is a solid at room temperature. What is the dominant
attractive force that exists between I2 molecules in a solid? - ANSWER-
London forces
Which one of the following molecules can form a hydrogen bond?
HBr
HCl
NH3
CH4
H2 - ANSWER-NH3
, PORTAGE LEARNING CHEM 210 - MODULE 2
EXAM WITH QUESTIONS AND ANSWERS
A hydrogen bond conform between hydrogen bond to oxygen and -
ANSWER-Nitrogen
What is the equilibrium, constant expression? - ANSWER-Ka =
[products]/[reactants]
Which buffer system is used by the renal system to maintain pH balance? -
ANSWER-bicarbonate buffer system
A buffer can neutralize only a certain amount of acid and base. We say that
this is it's: - ANSWER-Buffer capacity
The ion product is equal to what value? - ANSWER-1.0 x 10-14
In the equilibrium, constant expressions, the double brackets [ ] indicate: -
ANSWER-Concentration in molarity
A pH = 5.0 indicates a concentration of OH- (in M) of __________.
A. 5
B. 10-5
C. 10-9
D. 10-1
E. 101 - ANSWER-C. 10^-9
The hybrid of the central atom in water is _____ - ANSWER-Sp3
True or False: the amino acids serine and methionine both contain sulfur
atoms - ANSWER-False
True or false: the side chain of histidine is bonded to the backbone nitrogen
atom - ANSWER-False
True or false: the name of the molecule that binds to an enzyme is called
the holoenzyme - ANSWER-False
, PORTAGE LEARNING CHEM 210 - MODULE 2
EXAM WITH QUESTIONS AND ANSWERS
True or False: an inhibitor that binds at the active site is a non competitive
inhibitor - ANSWER-False
Which amino acids both have an R group (side chain) with an OH
functional group? - ANSWER-Ser and Thr
The formation of a peptide bond between two amino acids is an example of
an _______ reaction - ANSWER-Water-forming
The peptide Ala-Glu-Gly-Ala-Leu-Arg has _____ - ANSWER-Five peptide
bonds
Formally, when there are 99 or fewer amino acids are covalently linked
together that is called a _________. - ANSWER-Polypeptide
All of the 20 standard amino acids contain an R-group that is attached to
the:
A) α carbon
B) Carboxyl group
C) Amino group
D) β carbon
E) None of the above - ANSWER-A. α carbon
Which of the following correctly matches the amino acids with its one letter
abbreviation - ANSWER-Lysine,K
The order of amino acids in a protein is written ______. - ANSWER-N to C
terminus
Roughly how many amino acids are there in one turn of an α helix?
A) 1
B) 2.8
C) 3.6
D) 4.2
E) 10 - ANSWER-3.6
