Reversible Reactions and Equilibrium

Question 1

Which statement correctly defines dynamic equilibrium?

Revolt · Accepted Answer

At dynamic equilibrium, the rates of forward and reverse reactions are equal.

Question 2

Consider the reaction below.If the reaction is at dynamic equilibrium at 500 K, which statement applies to the given chemical system?

Revolt · Accepted Answer

The concentrations of the products and reactants do not change.

Question 3

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.

Question 4

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 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 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 7

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 8

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

Revolt · Accepted Answer

K subscript e q equals StartFraction StartBracket upper H subscript 2 EndBracket superscript 2 StartBracket upper O subscript 2 EndBracket over StartBracket upper H subscript 2 upper O EndBracket superscript 2 EndFraction.

Question 9

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 10

Which lists all of the substances that appear in equilibrium constant expressions?

Revolt · Accepted Answer

pure gas and aqueous solution

Reversible Reactions and Equilibrium Answers

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