Reversible Reactions and Equilibrium

Question 1

Which represents the correct equilibrium constant expression for the reaction below?

Revolt · Accepted Answer

K e q equals StartFraction StartBracket upper C u superscript 2 plus EndBracket over StartBracket upper A g superscript plus EndBracket superscript 2 EndFraction.

Question 2

Which statement correctly describes a reaction in dynamic equilibrium?

Revolt · Accepted Answer

At dynamic equilibrium, the reactions continue but the amounts of reactants and products do not change.

Question 3

Consider the reaction.At equilibrium at 600 K, the concentrations are as follows.[HF] = 5.82 x 10-2 M[H2] = 8.4 x 10-3 M[F2] = 8.4 x 10-3 MWhat is the value of Keq for the reaction expressed in scientific notation?

Revolt · Accepted Answer

2.1 x 10-2

Question 4

Consider the reaction.At equilibrium, the concentrations of the different species are as follows.[H2O] = 0.077 M[Cl2O] = 0.077 M[HClO] = 0.023 MWhat is the equilibrium constant for the reaction at this temperature?

Revolt · Accepted Answer

0.089

Question 5

Consider the reaction.At equilibrium, the concentrations are as follows.[NOCl] = 1.4 ´ 10–2 M[NO] = 1.2 ´ 10–3 M[Cl2] = 2.2 ´ 10–3 MWhat is the value of Keq for the reaction expressed in scientific notation?

Revolt · Accepted Answer

1.6 ´ 10–5

Question 6

Consider the general reversible reaction.What is the equilibrium constant expression for the given system?

Revolt · Accepted Answer

K e q equals StartFraction StartBracket upper C EndBracket superscript lower c StartBracket upper D EndBracket superscript lower D over StartBracket upper A EndBracket superscript lower a StartBracket upper B EndBracket superscript lower b EndFraction.

Question 7

Carbon monoxide (CO) reacts with hydrogen (H2) to form methane (CH4) and water (H2O).The reaction is at equilibrium at 1,000 K. The equilibrium constant of the reaction is 3.90. At equilibrium, the concentrations are as follows.[CO] = 0.30 M[H2] = 0.10 M[H2O] = 0.020 MWhat is the equilibrium concentration of CH4 expressed in scientific notation?

Revolt · Accepted Answer

5.9 x 10-2

Question 8

Consider the reaction below.At 500 K, the reaction is at equilibrium with the following concentrations.[PCI5]= 0.0095 M[PCI3] = 0.020[CI2] = 0.020 MWhat is the equilibrium constant for the given reaction?

Revolt · Accepted Answer

0.042

Question 9

Consider the equilibrium system below.If the system is at dynamic equilibrium, which statement is true?

Revolt · Accepted Answer

The rate of sublimation of the NH4CI crystals is equal to the rate of solidification of the NH4CI vapors.

Question 10

In the atmosphere, under the effect of ultraviolet rays, oxygen molecules combine to form ozone molecules, and ozone molecules also photodissociate to form oxygen molecules. Which of the following would be observed if this reaction is in dynamic equilibrium?

Revolt · Accepted Answer

The rates of the forward and reverse reactions will remain the same.

Reversible Reactions and Equilibrium Answers

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