UNE - CHEM 1011 - MIDTERM STUDY
GUIDE ACTUAL EXAM QUESTIONS AND
VERIFIED ANSWERS
Question 1
The reaction rate that is calculated at any specified time while the reaction is
proceeding is the
A. average rate
B. instantaneous rate
C. initial rate
D. rate constant
Correct Answer
B. instantaneous rate
(Ref: Week 3 Quiz)
A. average rate (beginning and end)
C. initial (rate at 0)
D. rate constant (k)
Page 1 of 33
,Question 2
A liquid in a tube will form a convex meniscus when
A. the adhesive forces are stronger than the cohesive forces
B. the cohesive forces are stronger than the adhesive forces
C. the adhesive forces are equal to the cohesive forces
D. it's impossible to predict
Correct Answer
B. the cohesive forces are stronger than the adhesive forces.
(Ref: Week 1 Quiz)
Question 3
The Arrhenius equation relates the activation energy and the rate constant, k, for
many chemical reactions:
𝑘=𝐴𝑒−𝐸a/𝑅𝑇
Correct Answer
A higher temperature represents a correspondingly greater fraction of molecules
possessing sufficient energy (RT) to overcome the activation barrier (Ea), as shown
in Figure 12.15(b). This yields a greater value for the rate constant and a
correspondingly faster reaction rate.
(Ref: Chemistry 2e book)
Question 4
The slowest step in a multistep reaction mechanism
Correct Answer
The rate-limiting/rate-determining step
(Ref: Chemistry 2e)
Page 2 of 33
,Question 5
Rate laws (sometimes called differential rate laws) or rate equations are?
Correct Answer
Mathematical expressions that describe the relationship between the rate of a
chemical reaction and the concentration of its reactants.
Rate and Concentration
Question 6
If the reaction CO2(aq) + H2O(l) ⇌ H2CO3(aq) is at equilibrium, what effect
would removing some H2CO3(aq) have?
A. The equilibrium will shift right
B. The equilibrium will shift left
C. The equilibrium constant will increase
D. The equilibrium constant will decrease
Correct Answer
A. The equilibrium will shift right
(Ref: Week 5 Quiz)
By removing some product, the equilibrium will shift right to re-establish
equilibrium per the Le Châtelier’s principle.
Page 3 of 33
, Question 7
Which of the following is true of soaps and detergents?
A. A single soap or detergent molecule surrounds nonpolar substances to form a
colloidal particle that can easily be washed away
B. The ionic end in a soap or detergent molecule orients toward a non-polar molecule
C. The hydrocarbon end of the soap or detergent orients toward water
D. Soaps and detergents are amphiphilic, allowing them aid the formation of
emulsions between immiscible liquids
Correct Answer
D. Soaps and detergents are amphiphilic, allowing them aid the formation of
emulsions between immiscible liquids
(Ref: Week 2 Quiz)
Page 4 of 33
GUIDE ACTUAL EXAM QUESTIONS AND
VERIFIED ANSWERS
Question 1
The reaction rate that is calculated at any specified time while the reaction is
proceeding is the
A. average rate
B. instantaneous rate
C. initial rate
D. rate constant
Correct Answer
B. instantaneous rate
(Ref: Week 3 Quiz)
A. average rate (beginning and end)
C. initial (rate at 0)
D. rate constant (k)
Page 1 of 33
,Question 2
A liquid in a tube will form a convex meniscus when
A. the adhesive forces are stronger than the cohesive forces
B. the cohesive forces are stronger than the adhesive forces
C. the adhesive forces are equal to the cohesive forces
D. it's impossible to predict
Correct Answer
B. the cohesive forces are stronger than the adhesive forces.
(Ref: Week 1 Quiz)
Question 3
The Arrhenius equation relates the activation energy and the rate constant, k, for
many chemical reactions:
𝑘=𝐴𝑒−𝐸a/𝑅𝑇
Correct Answer
A higher temperature represents a correspondingly greater fraction of molecules
possessing sufficient energy (RT) to overcome the activation barrier (Ea), as shown
in Figure 12.15(b). This yields a greater value for the rate constant and a
correspondingly faster reaction rate.
(Ref: Chemistry 2e book)
Question 4
The slowest step in a multistep reaction mechanism
Correct Answer
The rate-limiting/rate-determining step
(Ref: Chemistry 2e)
Page 2 of 33
,Question 5
Rate laws (sometimes called differential rate laws) or rate equations are?
Correct Answer
Mathematical expressions that describe the relationship between the rate of a
chemical reaction and the concentration of its reactants.
Rate and Concentration
Question 6
If the reaction CO2(aq) + H2O(l) ⇌ H2CO3(aq) is at equilibrium, what effect
would removing some H2CO3(aq) have?
A. The equilibrium will shift right
B. The equilibrium will shift left
C. The equilibrium constant will increase
D. The equilibrium constant will decrease
Correct Answer
A. The equilibrium will shift right
(Ref: Week 5 Quiz)
By removing some product, the equilibrium will shift right to re-establish
equilibrium per the Le Châtelier’s principle.
Page 3 of 33
, Question 7
Which of the following is true of soaps and detergents?
A. A single soap or detergent molecule surrounds nonpolar substances to form a
colloidal particle that can easily be washed away
B. The ionic end in a soap or detergent molecule orients toward a non-polar molecule
C. The hydrocarbon end of the soap or detergent orients toward water
D. Soaps and detergents are amphiphilic, allowing them aid the formation of
emulsions between immiscible liquids
Correct Answer
D. Soaps and detergents are amphiphilic, allowing them aid the formation of
emulsions between immiscible liquids
(Ref: Week 2 Quiz)
Page 4 of 33
