Chemistry: Matter and Change

Section 1: Equilibrium: A State of Dynamic Balance

Self Check Quizzes

1
What is the equilibrium constant expression for the following reaction?

ClNO2 + NO ‹–› NO2 + ClNO
A)Keq = [ClNO2][NO]/[NO2][ClNO]
B)Keq = [ClNO2][ClNO]/[NO][NO2]
C)Keq = [NO]2[ClNO]/[ClNO]2[NO]
D)Keq = [NO2][ClNO]/[ClNO2][NO]
2
What is the equilibrium constant expression for the following reaction?

2SO3 ‹–› 2SO2 + O2
A)Keq = [SO2]2[O2]/[SO3]2
B)Keq = [2SO2][2O]/[2SO3]
C)Keq = 2[SO2]2[O2]/2[SO3]
D)Keq = [SO3]2/[SO2]2[O2]
3
When Δ G is zero, ______________.
A)the reaction is spontaneous
B)the reaction is not spontaneous
C)the reaction is at equilibrium
D)the reaction has no energy
4
If Keq is greater than zero, then at equilibrium ________.
A)the amount of product is greater than the amount of reactant.
B)the amount of reactant is greater than the amount of product.
C)the amount of reactant and product are equal
D)the amount of product is zero.
5
What condition prevails at equilibrium, as shown in figures c and d.

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A)The forward reaction happens faster than the reverse reaction.
B)The forward reaction happens slower than the reverse reaction.
C)The forward reaction and the reverse reaction happen at the same rate.
D)The forward reaction has stopped.
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