WGU Chemistry D425 Verified Multiple Choice and
Conceptual Actual Emended Exam Questions With
Reviewed 100% Correct Detailed Answers
Guaranteed Pass!!Current Update
1. How many moles of hydroxide ions are there in 25 mL of 0.010M solution of
Ba(OH)2?
a. 7.5 x 10-1 mol
b. 5.0 x 10-1 mol
c. 2.5 x 10-1 mol
d. 5.0 x 10-4 mol
e. 2.5 x 10-4 mol - ANSWER d. 5.0 x 10-4 mol
2. What is the molarity of a solution that contains 46 grams of Na2SO4 (Mw =
142 g/mol) dissolved in enough water to make 750 mL of solution?
a. 2.3M
b. 0.60M
c. 0.52M
d. 0.43M
e. 0.19M - ANSWER d. 0.43M
3. Imagine that you go into the lab and measure 35 mL of a 0.60M stock
solution. You pour the 35 mL of stock solution into a beaker and dilute the
solution by adding another 35 mL of water. What is the molarity of the new
solution?
a. 1.2M
b. 0.60M
c. 0.30M
d. 0.15M
, e. 0.040M - ANSWER c. 0.30M
4. What is the correct expression for the equilibrium constant, K, for the
following reaction?
5. P4(s) + 5O2(g) ⇌ P4O10(s) - ANSWER K= 1/[O2]^5
6. If for a certain gas phase reaction mixture Q = 1, what can you say about the
reaction?
a. The reaction will proceed towards the product to achieve
equilibrium.
b. The equilibrium position will be determined by the value of K.
c. The reaction will proceed to the left to achieve equilibrium.
d. The reaction is already at equilibrium.
e. The reaction will go to completion. - ANSWER b. The equilibrium
position will be determined by the value of K.
7. If we increase the volume of the container, then the equilibrium will
_______ and the partial pressure of X2(g) will ____________.
a. Shift to the left, decrease
b. Shift to the left, increase
c. Shift to the right, decrease
d. Shift to the right, increase
e. Not shift, not change - ANSWER a. Shift to the left, decrease
8. If you decrease the temperature of this reaction the equilibrium will shift to
the________ and the value of K will __________.
a. right, not change
b. right, decrease
c. right, increase
, d. left, decrease
e. left, increase - ANSWER c. right, increase
9. Which of the following combinations represent a weak acid and weak base
conjugate pair?
a. HCl and NaCl
b. KH2PO4 and Na3PO4
c. CH3COOH and KCH3COO
d. both choice b and choice c
e. choice a, choice b and choice c - ANSWER c. CH3COOH and
KCH3COO
10.What is the pH of 0.050M HClO4?
a. 0.90
b. 1.3
c. 3.0
d. 7.0
e. 12.7 - ANSWER b. 1.3
11.What is the pH of 0.080M NH3?
a. 1.1
b. 2.9
c. 8.8
d. 11.1
e. 12.9 - ANSWER d. 11.1
12.Which of the following three salts would be basic if dissolved in water?
I. KNO2 II. NH4Cl III. Zn(NO3)2
13.I only
Conceptual Actual Emended Exam Questions With
Reviewed 100% Correct Detailed Answers
Guaranteed Pass!!Current Update
1. How many moles of hydroxide ions are there in 25 mL of 0.010M solution of
Ba(OH)2?
a. 7.5 x 10-1 mol
b. 5.0 x 10-1 mol
c. 2.5 x 10-1 mol
d. 5.0 x 10-4 mol
e. 2.5 x 10-4 mol - ANSWER d. 5.0 x 10-4 mol
2. What is the molarity of a solution that contains 46 grams of Na2SO4 (Mw =
142 g/mol) dissolved in enough water to make 750 mL of solution?
a. 2.3M
b. 0.60M
c. 0.52M
d. 0.43M
e. 0.19M - ANSWER d. 0.43M
3. Imagine that you go into the lab and measure 35 mL of a 0.60M stock
solution. You pour the 35 mL of stock solution into a beaker and dilute the
solution by adding another 35 mL of water. What is the molarity of the new
solution?
a. 1.2M
b. 0.60M
c. 0.30M
d. 0.15M
, e. 0.040M - ANSWER c. 0.30M
4. What is the correct expression for the equilibrium constant, K, for the
following reaction?
5. P4(s) + 5O2(g) ⇌ P4O10(s) - ANSWER K= 1/[O2]^5
6. If for a certain gas phase reaction mixture Q = 1, what can you say about the
reaction?
a. The reaction will proceed towards the product to achieve
equilibrium.
b. The equilibrium position will be determined by the value of K.
c. The reaction will proceed to the left to achieve equilibrium.
d. The reaction is already at equilibrium.
e. The reaction will go to completion. - ANSWER b. The equilibrium
position will be determined by the value of K.
7. If we increase the volume of the container, then the equilibrium will
_______ and the partial pressure of X2(g) will ____________.
a. Shift to the left, decrease
b. Shift to the left, increase
c. Shift to the right, decrease
d. Shift to the right, increase
e. Not shift, not change - ANSWER a. Shift to the left, decrease
8. If you decrease the temperature of this reaction the equilibrium will shift to
the________ and the value of K will __________.
a. right, not change
b. right, decrease
c. right, increase
, d. left, decrease
e. left, increase - ANSWER c. right, increase
9. Which of the following combinations represent a weak acid and weak base
conjugate pair?
a. HCl and NaCl
b. KH2PO4 and Na3PO4
c. CH3COOH and KCH3COO
d. both choice b and choice c
e. choice a, choice b and choice c - ANSWER c. CH3COOH and
KCH3COO
10.What is the pH of 0.050M HClO4?
a. 0.90
b. 1.3
c. 3.0
d. 7.0
e. 12.7 - ANSWER b. 1.3
11.What is the pH of 0.080M NH3?
a. 1.1
b. 2.9
c. 8.8
d. 11.1
e. 12.9 - ANSWER d. 11.1
12.Which of the following three salts would be basic if dissolved in water?
I. KNO2 II. NH4Cl III. Zn(NO3)2
13.I only
