Multiple Choice Quiz

Multiple Choice Quiz

Multiple Choice Quiz


1		Consider the reaction (A → B) that goes to completion. Which of the following statements is FALSE?
			A)	ΔGº usually has negative value.
			B)	ΔHº has a negative value.
			C)	The equilibrium constant K is greater than 1.
			D)	The equilibrium constant K is less than 1.


2		Consider the equilibrium between A and B, for which ΔGº is –5 kcal/mol. Which of the following statements is FALSE?
			A)	The equilibrium constant is 10³.
			B)	The equilibrium constant is 10^–3.
			C)	The reaction is exothermic.
			D)	At equilibrium, mostly B is present.


3		Which of the following statements is FALSE?
			A)	The rate of a reaction depends on its energy of activation.
			B)	A more negative value of ΔGº increases the rate of a reaction.
			C)	The rate of reaction increases with temperature.
			D)	A catalyst will affect the rate of a reaction, but will not affect the value of ΔGº.


4		Examine the reaction scheme and energy diagram and determine the largest rate constant.
			A)	k₂
			B)	k₁
			C)	k₃
			D)	k_-1


5		Examine the reaction scheme and energy diagram and determine the smallest rate constant.
			A)	k₁
			B)	k₂
			C)	k₃
			D)	k_–1


6		Examine the reaction scheme and energy diagram and determine which step is rate-determining for the conversion of A to D.
			A)	A to 1
			B)	A to D
			C)	A to B
			D)	A to 2


7		Examine the reaction scheme and energy diagram and determine the ΔG^o for the conversion of A to D.
			A)	A to 1
			B)	A to D
			C)	A to C
			D)	A to 3


8		In the following energy diagram, where is the transition state for the conversion of A to D.
			A)	1
			B)	2
			C)	3
			D)	B


9		Which energy diagram corresponds to a reaction in which an intermediate would build up to a significant concentration?
			A)
			B)
			C)
			D)


10		Which reaction coordinate energy diagram corresponds to the following scheme?
			A)
			B)
			C)
			D)


11		For the reaction scheme
			A)	the first step is endothermic and the second step is exothermic.
			B)	both steps are exothermic.
			C)	both steps are endothermic.
			D)	the first step is exothermic and the second is endothermic.


12		Consider the two-step reaction and energy profile shown below. List the rate constants in increasing order (that is, slowest first and fastest last).
			A)	k₁>k₃>k₂>k₄
			B)	k₂>k₃>k₁>k₄
			C)	k₁>k₃>k₄>k₂
			D)	k₂>k₃>k₄>k₁


13		The following reaction is first order in each of A and B: What is the rate of the reaction if the concentration of A and B are decreased by 10 times each?
			A)	The rate is increased 100 times.
			B)	The rate is increased 10 times.
			C)	The rate is decreased 10 times.
			D)	The rate is decreased 100 times.


14		What feature of a free energy diagram reveals whether the reaction is endothermic or exothermic?
			A)	the height of the transition state
			B)	the number of transition states
			C)	the relative energies of reactant and products
			D)	the relative energies of the intermediates


15		Where is/are the transition state(s) found in a free energy diagram?
			A)	at the highest energy point(s) on the curve
			B)	at the lowest energy point(s) on the curve
			C)	with the intermediate(s)
			D)	with the product(s)


16		What is the K_eq of the following reaction?
			A)	1.7
			B)	0.17
			C)	17
			D)	0.017

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