CHEM 210 MODULE 9 COMPLETE STUDY
GUIDE WITH SOLVED QUESTIONS
◉ what is a unique molecule. which of the following contributes to
water's unique place in the chemical world?
A. the geometry of the molecule
B. the polarity of the O-H bonds
C. the ability of water molecules to hydrogen bond
D. the bond angle of water
E. all of the answers are correct.
Answer: E. all of the answers are correct
◉ what factor contributes to the bent shape of a water molecule?
A. the dipole arrows in a water molecule
B. the unshared electron pairs of the oxygen atom
C. the electronegativity difference between hydrogen and oxygen
D. the unequal electron sharing between hydrogen and oxygen
E. none of the answers are correct.
Answer: B. the unshared electron pairs of the oxygen atom
◉ the H+ concentration of a solution is 1.2x10(-3) M. what is the pH?
,A. -1.20
B. 1.20
C. 3.12
D. -2.92
E. 2.92.
Answer: E. 2.92
◉ the pH of a solution of 3.2 x 10 (-6) M NaOH is:
A. 3.7
B. 3.7x10(-10)
C. 4.5
D. 13
E. 8.7.
Answer: C. 4.5
◉ if the Ka of an acid is 1.38x10 (-7), what is the pKa?
A. 6.86
B. 7.14
C. 8.68
D. 10.7
E. 1.38.
Answer: A. 6.86
, ◉ list the acids in decreasing order of strength (strongest to
weakest):
nitrous acid (Ka=4.0x10(-4); acetic acid (Ka= 1.7x10(-5); phosphoric
acid (Ka=7.3x10(-3)
A. nitrous acid, acetic acid, phosphoric acid
B. acetic acid, nitrous acid, phosphoric acid
C. phosphoric acid, nitrous acid, acetic acid
D. acetic acid, phosphoric acid, nitrous acid
E. none of the above.
Answer: C. phosphoric acid, nitrous acid, acetic acid
◉ Elemental iodine (I2) is a solid at room temperature. What is the
dominant attractive force that exists among different I2 molecules in
the solid?
A. London forces
B. hydrogen bonds
C. halogen forces
D. dipole-dipole forces
E. covalent bond.
Answer: A. london forces
◉ which one of the following molecules can form a hydrogen bond?
GUIDE WITH SOLVED QUESTIONS
◉ what is a unique molecule. which of the following contributes to
water's unique place in the chemical world?
A. the geometry of the molecule
B. the polarity of the O-H bonds
C. the ability of water molecules to hydrogen bond
D. the bond angle of water
E. all of the answers are correct.
Answer: E. all of the answers are correct
◉ what factor contributes to the bent shape of a water molecule?
A. the dipole arrows in a water molecule
B. the unshared electron pairs of the oxygen atom
C. the electronegativity difference between hydrogen and oxygen
D. the unequal electron sharing between hydrogen and oxygen
E. none of the answers are correct.
Answer: B. the unshared electron pairs of the oxygen atom
◉ the H+ concentration of a solution is 1.2x10(-3) M. what is the pH?
,A. -1.20
B. 1.20
C. 3.12
D. -2.92
E. 2.92.
Answer: E. 2.92
◉ the pH of a solution of 3.2 x 10 (-6) M NaOH is:
A. 3.7
B. 3.7x10(-10)
C. 4.5
D. 13
E. 8.7.
Answer: C. 4.5
◉ if the Ka of an acid is 1.38x10 (-7), what is the pKa?
A. 6.86
B. 7.14
C. 8.68
D. 10.7
E. 1.38.
Answer: A. 6.86
, ◉ list the acids in decreasing order of strength (strongest to
weakest):
nitrous acid (Ka=4.0x10(-4); acetic acid (Ka= 1.7x10(-5); phosphoric
acid (Ka=7.3x10(-3)
A. nitrous acid, acetic acid, phosphoric acid
B. acetic acid, nitrous acid, phosphoric acid
C. phosphoric acid, nitrous acid, acetic acid
D. acetic acid, phosphoric acid, nitrous acid
E. none of the above.
Answer: C. phosphoric acid, nitrous acid, acetic acid
◉ Elemental iodine (I2) is a solid at room temperature. What is the
dominant attractive force that exists among different I2 molecules in
the solid?
A. London forces
B. hydrogen bonds
C. halogen forces
D. dipole-dipole forces
E. covalent bond.
Answer: A. london forces
◉ which one of the following molecules can form a hydrogen bond?
