UNE General Chemistry II Midterm Test Bank
Weeks 1–7 2026 | Latest Update 2026 | 100%
Correct Answers | Actual Exam Prep
W2, Q2
Which of the following will have the highest vapor pressure?
A) 0.1 M NaCl in water
B) 0.5 M NaCl in water
C) 1.0 M NaCl in water
D) 2.0 M NaCl in water - correct answer0.1 M NaCl in water
W5, Q5
In the unfinished ICE table
______________2 NO + Cl2 ⇌ 2NOCl
Initial ______.15 M__.15M_______ 0
Change
Eq _________________________________0?
What will be the expression for the equilibrium concentration of NOCl?
A) x
B) 2x
C) 0.150 + x
D) 0.150 - x - correct answer2x
W4, Q4
Which of the following is true about reaction mechanisms?
A) Elementary reactions produce unstable transition states
B) The molecularity of a reaction is the number of intermediate steps in a reaction
C) A reaction mechanism includes intermediates that aren't represented as products or
reactants in a balanced chemical equation
D) The rate-limiting step is the fastest step in a reaction mechanism - correct answerA
reaction mechanism includes intermediates that aren't represented as products or
reactants in a balanced chemical equation
Each step in a reaction mechanism is an elementary reaction.
W6, Q6
Tartaric acid is a weak acid that is commonly added to wine to prevent spoilage during
fermentation. A 0.175 M solution of tartaric acid has a pH of 2.08.
What is the percent ionization of tartaric acid?
,A) 2.8 %
B) 5.3 %
C) 4.8 %
D) 3.6 % - correct answer4.8%
W6, Q6
Pyridine is a weak base with the chemical formula C5H5N. What is the value of Kb for a
0.175 M solution of pyridine if the solution at equilibrium has [C5H5NH+] = 1.80 x 10^-5
M and [OH-] = 1.41 x 10^-5?
A) 1.45 x 10^-9 M
B) 1.85 x 10^-9 M
C) 1.70 x 10^-9 M
D) 1.14 x 10^-9 M - correct answer1.45 x 10^-9 M
W6
In the reaction
CN- + H2O ⇄ HCN + OH-
which is an acid-base conjugate pair?
A) H2O and OH-
B) HCN and OH-
C) H2O and HCN
D) CN- and H2O - correct answerH2O and OH-
W6
A can of sparkling water has a hydronium ion concentration of 1.5 x 10-4 M. What is the
pH of the sparkling water?
A) 3.8
B) 10.2
C) 8.8
D) 3.3 - correct answer3.8
W6
In in the dissolution of acetic acid in water, CH3COOH + H2O ⇌ H3O+ + CH3COO-
A) H2O is the base and H3O+ is the conjugate acid
B) CH3COOH is the acid and H2O is the conjugate base
C) CH3COOH is the acid and CH3COO- is the conjugate base
D) H2O is the base and CH3COOH is the conjugate acid - correct answerH2O is the
base and H3O+ is the conjugate acid
W7, Q7
A buffer
,A) Is a solution containing appreciable amounts of a strong conjugate acid-base pair
B) Changes pH significantly when small amounts of strong acid or strong base are
added
C) Can be designed to work well at pH below 7 or above 7, but not across the entire pH
range
D) Works well for all concentrations of conjugate acid-base pairs - correct answerCan
be designed to work well at pH below 7 or above 7, but not across the entire pH range
W7, Q7
A good buffer
A) Should be made from weak bases and their salts for pH less than 7
B) Should be made with a much higher concentration of acid than its conjugate base
C) Has an unlimited buffer capacity, and continues to work regardless of the amount of
acid or base added to the buffer solution
D) Should be made from weak acids and their salts for pH less than 7 - correct
answerShould be made from weak acids and their salts for pH less than 7
W7, Q7
In the titration of 15.00 mL of 0.050 M CH3COOH with 0.100 M NaOH, what is the pH
after 9.50 mL of NaOH is added?
A) 12.5
B) 11.9
C) 12.2
D) 11.6 - correct answer11.9
W7
A solution of potassium iodide, KI in water will be
A) Acidic
B) Neutral
C) Basic
D) Strongly acidic - correct answerNeutral
W7, Q7
The titration curve above represents the titration of
(Equivalence point is at pH 7, steep increase)
A) A strong acid with a weak base
B) A weak acid with a strong base
C) A strong acid with a strong base
, D) It's impossible to predict - correct answerA strong acid with a strong base
W6
Egg whites have a pH of about 8.5. Egg whites are
A) Acidic
B) Basic
C) Neutral
D) Impossible to know - correct answerBasic
W7
The color change interval of an acid-base indicator
A) Is the pH range over which a color change is observed, and is typically a range of
less than 1 pH unit
B) Is a single pH value when the color change is observed
C) Is the pH range over which a color change is observed, and is typically a range of 1-
3 pH units
D) Is the pH range over which a color change is observed, and is typically a range of
more than 3 pH units - correct answerIs the pH range over which a color change is
observed, and is typically a range of 1-3 pH units
W7, Q7
Which of the following is true of bromphenol blue, a pH indicator that changes from
yellow to blue in the color change interval of pH 3-5
A) The color would appear to change slowly, with the intermediate color green
observable for an extended period, regardless of the endpoint of the titration
B) The color change would appear to be very abrupt for a titration with an endpoint at
pH 9
C) The color change would appear to be very abrupt for a titration with an endpoint at
pH 4
D) The color change would appear to be very abrupt regardless of the endpoint of the
titration - correct answerThe color change would appear to be very abrupt for a titration
with an endpoint at pH 4
W7
A buffer
Weeks 1–7 2026 | Latest Update 2026 | 100%
Correct Answers | Actual Exam Prep
W2, Q2
Which of the following will have the highest vapor pressure?
A) 0.1 M NaCl in water
B) 0.5 M NaCl in water
C) 1.0 M NaCl in water
D) 2.0 M NaCl in water - correct answer0.1 M NaCl in water
W5, Q5
In the unfinished ICE table
______________2 NO + Cl2 ⇌ 2NOCl
Initial ______.15 M__.15M_______ 0
Change
Eq _________________________________0?
What will be the expression for the equilibrium concentration of NOCl?
A) x
B) 2x
C) 0.150 + x
D) 0.150 - x - correct answer2x
W4, Q4
Which of the following is true about reaction mechanisms?
A) Elementary reactions produce unstable transition states
B) The molecularity of a reaction is the number of intermediate steps in a reaction
C) A reaction mechanism includes intermediates that aren't represented as products or
reactants in a balanced chemical equation
D) The rate-limiting step is the fastest step in a reaction mechanism - correct answerA
reaction mechanism includes intermediates that aren't represented as products or
reactants in a balanced chemical equation
Each step in a reaction mechanism is an elementary reaction.
W6, Q6
Tartaric acid is a weak acid that is commonly added to wine to prevent spoilage during
fermentation. A 0.175 M solution of tartaric acid has a pH of 2.08.
What is the percent ionization of tartaric acid?
,A) 2.8 %
B) 5.3 %
C) 4.8 %
D) 3.6 % - correct answer4.8%
W6, Q6
Pyridine is a weak base with the chemical formula C5H5N. What is the value of Kb for a
0.175 M solution of pyridine if the solution at equilibrium has [C5H5NH+] = 1.80 x 10^-5
M and [OH-] = 1.41 x 10^-5?
A) 1.45 x 10^-9 M
B) 1.85 x 10^-9 M
C) 1.70 x 10^-9 M
D) 1.14 x 10^-9 M - correct answer1.45 x 10^-9 M
W6
In the reaction
CN- + H2O ⇄ HCN + OH-
which is an acid-base conjugate pair?
A) H2O and OH-
B) HCN and OH-
C) H2O and HCN
D) CN- and H2O - correct answerH2O and OH-
W6
A can of sparkling water has a hydronium ion concentration of 1.5 x 10-4 M. What is the
pH of the sparkling water?
A) 3.8
B) 10.2
C) 8.8
D) 3.3 - correct answer3.8
W6
In in the dissolution of acetic acid in water, CH3COOH + H2O ⇌ H3O+ + CH3COO-
A) H2O is the base and H3O+ is the conjugate acid
B) CH3COOH is the acid and H2O is the conjugate base
C) CH3COOH is the acid and CH3COO- is the conjugate base
D) H2O is the base and CH3COOH is the conjugate acid - correct answerH2O is the
base and H3O+ is the conjugate acid
W7, Q7
A buffer
,A) Is a solution containing appreciable amounts of a strong conjugate acid-base pair
B) Changes pH significantly when small amounts of strong acid or strong base are
added
C) Can be designed to work well at pH below 7 or above 7, but not across the entire pH
range
D) Works well for all concentrations of conjugate acid-base pairs - correct answerCan
be designed to work well at pH below 7 or above 7, but not across the entire pH range
W7, Q7
A good buffer
A) Should be made from weak bases and their salts for pH less than 7
B) Should be made with a much higher concentration of acid than its conjugate base
C) Has an unlimited buffer capacity, and continues to work regardless of the amount of
acid or base added to the buffer solution
D) Should be made from weak acids and their salts for pH less than 7 - correct
answerShould be made from weak acids and their salts for pH less than 7
W7, Q7
In the titration of 15.00 mL of 0.050 M CH3COOH with 0.100 M NaOH, what is the pH
after 9.50 mL of NaOH is added?
A) 12.5
B) 11.9
C) 12.2
D) 11.6 - correct answer11.9
W7
A solution of potassium iodide, KI in water will be
A) Acidic
B) Neutral
C) Basic
D) Strongly acidic - correct answerNeutral
W7, Q7
The titration curve above represents the titration of
(Equivalence point is at pH 7, steep increase)
A) A strong acid with a weak base
B) A weak acid with a strong base
C) A strong acid with a strong base
, D) It's impossible to predict - correct answerA strong acid with a strong base
W6
Egg whites have a pH of about 8.5. Egg whites are
A) Acidic
B) Basic
C) Neutral
D) Impossible to know - correct answerBasic
W7
The color change interval of an acid-base indicator
A) Is the pH range over which a color change is observed, and is typically a range of
less than 1 pH unit
B) Is a single pH value when the color change is observed
C) Is the pH range over which a color change is observed, and is typically a range of 1-
3 pH units
D) Is the pH range over which a color change is observed, and is typically a range of
more than 3 pH units - correct answerIs the pH range over which a color change is
observed, and is typically a range of 1-3 pH units
W7, Q7
Which of the following is true of bromphenol blue, a pH indicator that changes from
yellow to blue in the color change interval of pH 3-5
A) The color would appear to change slowly, with the intermediate color green
observable for an extended period, regardless of the endpoint of the titration
B) The color change would appear to be very abrupt for a titration with an endpoint at
pH 9
C) The color change would appear to be very abrupt for a titration with an endpoint at
pH 4
D) The color change would appear to be very abrupt regardless of the endpoint of the
titration - correct answerThe color change would appear to be very abrupt for a titration
with an endpoint at pH 4
W7
A buffer
