Portage Learning Chem 210 Module 2 Exam
Question 1
pts
The pH of a solution of 0.0010 M NaOH is:
1
Correct!
11
[Kw=[H+][OH-] = 1.0 x 10-14; [H+][0.0010] = 1.0 x 10-14 [H+]=1.0 x 10-11;
pH=-log[1.0 x 10-11;]=11]
8
0
14
Question 2
pts
Water is a unique molecule. Which of the following contributes to water’s 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
Correct!
All of the answers are correct
Question 3
pts
The bent shape of water is due to .
The dipole arrows in a water molecule
The electronegativity difference between hydrogen and oxygen
,You Answered
The unequal electron sharing between hydrogen and oxygen
Correct Answer
The unshared electron pairs on the oxygen atom
None of the answers are correct
Question 4
pts
Which diagrams correctly represent a hydrogen bond?
Correct Answer
A and D
A and C
You Answered
B and C
C and D
B and D
Question 5
pts
The H+ concentration of a solution is 1.2 x 10-3 M. What is the pH?
-1.20
1.20
You Answered
, 3.12
-2.92
Correct Answer
2.92
Question 6
pts
If the Ka of an acid is 5.63 x 10-3, what is the pKa?
6.86
Correct!
2.25
[pKa = -log(5.63 x 10-3) = 2.25]
5.63
10.12
1.38
Question 7
pts
List the acids in DECREASING order of strength (strongest to weakest):
Nitrous acid (Ka = 4.0 x 10-4); acetic acid (Ka = 1.7 x 10-5); phosphoric acid (Ka = 7.3 x 10-3)
Nitrous acid, acetic acid, phosphoric acid
Acetic acid, nitrous acid, phosphoric acid
Correct!
Phosphoric acid, nitrous acid, acetic acid
Acetic acid, phosphoric acid, nitrous acid
None of the above
Question 8
pts
Elemental iodine (I2) is a solid at room temperature. What is the dominant attractive force that
exists between I2 molecules in the solid?
Correct Answer
Question 1
pts
The pH of a solution of 0.0010 M NaOH is:
1
Correct!
11
[Kw=[H+][OH-] = 1.0 x 10-14; [H+][0.0010] = 1.0 x 10-14 [H+]=1.0 x 10-11;
pH=-log[1.0 x 10-11;]=11]
8
0
14
Question 2
pts
Water is a unique molecule. Which of the following contributes to water’s 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
Correct!
All of the answers are correct
Question 3
pts
The bent shape of water is due to .
The dipole arrows in a water molecule
The electronegativity difference between hydrogen and oxygen
,You Answered
The unequal electron sharing between hydrogen and oxygen
Correct Answer
The unshared electron pairs on the oxygen atom
None of the answers are correct
Question 4
pts
Which diagrams correctly represent a hydrogen bond?
Correct Answer
A and D
A and C
You Answered
B and C
C and D
B and D
Question 5
pts
The H+ concentration of a solution is 1.2 x 10-3 M. What is the pH?
-1.20
1.20
You Answered
, 3.12
-2.92
Correct Answer
2.92
Question 6
pts
If the Ka of an acid is 5.63 x 10-3, what is the pKa?
6.86
Correct!
2.25
[pKa = -log(5.63 x 10-3) = 2.25]
5.63
10.12
1.38
Question 7
pts
List the acids in DECREASING order of strength (strongest to weakest):
Nitrous acid (Ka = 4.0 x 10-4); acetic acid (Ka = 1.7 x 10-5); phosphoric acid (Ka = 7.3 x 10-3)
Nitrous acid, acetic acid, phosphoric acid
Acetic acid, nitrous acid, phosphoric acid
Correct!
Phosphoric acid, nitrous acid, acetic acid
Acetic acid, phosphoric acid, nitrous acid
None of the above
Question 8
pts
Elemental iodine (I2) is a solid at room temperature. What is the dominant attractive force that
exists between I2 molecules in the solid?
Correct Answer
