CHEM 121 Final Exam
CHEM 121 FINAL EXAM INCLUDES ACCURATE AND VERIFIED QUESTIONS
COVERING FOUNDATIONAL GENERAL CHEMISTRY TOPICS SUCH AS ATOMIC
STRUCTURE, PERIODIC TRENDS, STOICHIOMETRY, CHEMICAL BONDING, GAS
LAWS, SOLUTIONS, THERMOCHEMISTRY, AND BASIC EQUILIBRIUM
Which of the following statements can be assumed to be true about how reactions occur?
A) Reactant particles must collide with each other.
B) Energy must be absorbed as the reaction proceeds.
C) Catalysts must be present in the reaction.
D) More than one statement can be true. - ANSWER-more than one statement can be true
a rapid reaction is distinguished by
A) being unaffected by catalysts.
B) having a large heat of reaction.
C) having a small value of activation energy. D) having a large value of activation energy.
E) having a small heat of reaction. - ANSWER-having a small value of activation energy.
For a chemical reaction to occur, all of the following must happen except
A) a large enough number of collisions must occur.
B) chemical bonds in the products must form. C) chemical bonds in the reactants must break.
D) reactant particles must collide with enough energy for change to occur. E) reactant particles
must collide with the correct orientation. - ANSWER-reactant particles must collide with the
correct orientation.
Which factors would decrease the rate of a reaction?
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, CHEM 121 Final Exam
I. Lowering the temperature
II. Increasing the concentration of reactants
III. Adding a catalyst
A) I only B) II and III
C) I and III
D) III only
E) II only - ANSWER-I only: lowering the temperature
In the reaction energy diagrams shown, reaction A is ________, and it occurs ________ reaction
A) endergonic; faster than
B) exergonic; at the same rate as
C) exergonic; faster than D) exergonic; slower than
E) endergonic; slower than - ANSWER-exergonic; slower than
In the reaction energy diagrams shown, reaction B is ________, and it occurs ________ reaction
A) exergonic; slower than
B) exergonic; at the same rate as
C) endergonic; faster than
D) endergonic; slower than
E) exergonic; faster than - ANSWER-endergonic; faster than
In the reaction A + B → AB, which of the following will not increase the rate?
A) adding B
B) adding A
C) decreasing the temperature
D) adding a catalyst
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, CHEM 121 Final Exam
E) increasing the temperature - ANSWER-decreasing the temperature
Which statement best describes the way a catalyst works?
A) It decreases the value of Eact.
B) It decreases the value of ΔH. C) It increases the value of ΔG. D) It increases the value of ΔH.
E) It increases the value of Eact. - ANSWER-It decreases the value of Eact.
Which of the following conditions characterizes a system in a state of chemical equilibrium?
A) Reactants are being consumed at the same rate they are being produced.
B) Concentrations of reactants and products are equal.
C) Reactant molecules no longer react with each other.
D) Product concentrations are greater than reactant concentrations. E) Rate of forward reaction
has dropped to zero. - ANSWER-Reactants are being consumed at the same rate they are being
produced.
When a reaction system is at equilibrium
A) the amounts of reactants and products are exactly equal.
B) the rates of the reaction in the forward and reverse directions are exactly equal.
C) there is no more chemistry happening.
D) the reaction rate in the reverse direction is at a minimum. E) the reaction rate in the forward
direction is at a maximum. - ANSWER-the rates of the reaction in the forward and reverse
directions are exactly equal.
Which change to this reaction system would cause the equilibrium to shift to the right?
A) removal of H2 (g)
B) heating the system
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, CHEM 121 Final Exam
C) lowering the temperature
D) addition of a catalyst E) addition of NH3 (g) - ANSWER-lowering the temperature
Which of the following can serve as the solvent in a solution?
A) a solid
B) a gas
C) a liquid
D) a mixture of commingled liquids
E) all of the above - ANSWER-all of the above
Which term best describes the water in a sugarwater solution?
A) solvent
B) solute
C) reactants
D) product - ANSWER-solvent
Which statement best explains the meaning of the phrase "like dissolves like"?
A) A solvent will easily dissolve a solute of similar mass. B) A solvent and solute with similar
intermolecular forces will readily form a solution.
C) The only true solutions are formed when water dissolves a polar solute.
D) The only true solutions are formed when water dissolves a non-polar solute. E) None of these
statements is correct. - ANSWER-A solvent and solute with similar intermolecular forces will
readily form a solution.
In a mixture of 5 mL water, 10 mL alcohol, and 50 mL acetone the solvent(s) are
A) acetone and alcohol
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CHEM 121 FINAL EXAM INCLUDES ACCURATE AND VERIFIED QUESTIONS
COVERING FOUNDATIONAL GENERAL CHEMISTRY TOPICS SUCH AS ATOMIC
STRUCTURE, PERIODIC TRENDS, STOICHIOMETRY, CHEMICAL BONDING, GAS
LAWS, SOLUTIONS, THERMOCHEMISTRY, AND BASIC EQUILIBRIUM
Which of the following statements can be assumed to be true about how reactions occur?
A) Reactant particles must collide with each other.
B) Energy must be absorbed as the reaction proceeds.
C) Catalysts must be present in the reaction.
D) More than one statement can be true. - ANSWER-more than one statement can be true
a rapid reaction is distinguished by
A) being unaffected by catalysts.
B) having a large heat of reaction.
C) having a small value of activation energy. D) having a large value of activation energy.
E) having a small heat of reaction. - ANSWER-having a small value of activation energy.
For a chemical reaction to occur, all of the following must happen except
A) a large enough number of collisions must occur.
B) chemical bonds in the products must form. C) chemical bonds in the reactants must break.
D) reactant particles must collide with enough energy for change to occur. E) reactant particles
must collide with the correct orientation. - ANSWER-reactant particles must collide with the
correct orientation.
Which factors would decrease the rate of a reaction?
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, CHEM 121 Final Exam
I. Lowering the temperature
II. Increasing the concentration of reactants
III. Adding a catalyst
A) I only B) II and III
C) I and III
D) III only
E) II only - ANSWER-I only: lowering the temperature
In the reaction energy diagrams shown, reaction A is ________, and it occurs ________ reaction
A) endergonic; faster than
B) exergonic; at the same rate as
C) exergonic; faster than D) exergonic; slower than
E) endergonic; slower than - ANSWER-exergonic; slower than
In the reaction energy diagrams shown, reaction B is ________, and it occurs ________ reaction
A) exergonic; slower than
B) exergonic; at the same rate as
C) endergonic; faster than
D) endergonic; slower than
E) exergonic; faster than - ANSWER-endergonic; faster than
In the reaction A + B → AB, which of the following will not increase the rate?
A) adding B
B) adding A
C) decreasing the temperature
D) adding a catalyst
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, CHEM 121 Final Exam
E) increasing the temperature - ANSWER-decreasing the temperature
Which statement best describes the way a catalyst works?
A) It decreases the value of Eact.
B) It decreases the value of ΔH. C) It increases the value of ΔG. D) It increases the value of ΔH.
E) It increases the value of Eact. - ANSWER-It decreases the value of Eact.
Which of the following conditions characterizes a system in a state of chemical equilibrium?
A) Reactants are being consumed at the same rate they are being produced.
B) Concentrations of reactants and products are equal.
C) Reactant molecules no longer react with each other.
D) Product concentrations are greater than reactant concentrations. E) Rate of forward reaction
has dropped to zero. - ANSWER-Reactants are being consumed at the same rate they are being
produced.
When a reaction system is at equilibrium
A) the amounts of reactants and products are exactly equal.
B) the rates of the reaction in the forward and reverse directions are exactly equal.
C) there is no more chemistry happening.
D) the reaction rate in the reverse direction is at a minimum. E) the reaction rate in the forward
direction is at a maximum. - ANSWER-the rates of the reaction in the forward and reverse
directions are exactly equal.
Which change to this reaction system would cause the equilibrium to shift to the right?
A) removal of H2 (g)
B) heating the system
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, CHEM 121 Final Exam
C) lowering the temperature
D) addition of a catalyst E) addition of NH3 (g) - ANSWER-lowering the temperature
Which of the following can serve as the solvent in a solution?
A) a solid
B) a gas
C) a liquid
D) a mixture of commingled liquids
E) all of the above - ANSWER-all of the above
Which term best describes the water in a sugarwater solution?
A) solvent
B) solute
C) reactants
D) product - ANSWER-solvent
Which statement best explains the meaning of the phrase "like dissolves like"?
A) A solvent will easily dissolve a solute of similar mass. B) A solvent and solute with similar
intermolecular forces will readily form a solution.
C) The only true solutions are formed when water dissolves a polar solute.
D) The only true solutions are formed when water dissolves a non-polar solute. E) None of these
statements is correct. - ANSWER-A solvent and solute with similar intermolecular forces will
readily form a solution.
In a mixture of 5 mL water, 10 mL alcohol, and 50 mL acetone the solvent(s) are
A) acetone and alcohol
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