Reversible Reactions and Equilibrium — Quiz

Question 1

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 2

Consider the reaction below. 2 cap n sub 2 cap o sub 5 g long left right arrow 4 cap n cap o sub 2 g plus cap o sub 2 times g If the reaction is at dynamic equilibrium at 500 cap k , which statement applies to the given chemical system?

Revolt · Accepted Answer

The concentrations of the products and reactants do not change.

Question 3

The reaction below is at dynamic equilibrium. cap n sub 2 times g plus 3 cap h sub 2 g long left right arrow 2 NH sub 3 g Which statement is true for the equilibrium system?

Revolt · Accepted Answer

The rate of the forward reaction equals the rate of the reverse reaction.

Question 4

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

Revolt · Accepted Answer

pure gas and aqueous solution

Question 5

Consider the equilibrium system below. NH sub 4 Cl cap s long left right arrow NH sub 4 Cl g If the system is at dynamic equilibrium, which statement is true?

Revolt · Accepted Answer

The rate of sublimation of the NH sub 4 Cl crystals is equal to the rate of solidification of the NH sub 4 Cl vapors.

Question 6

Consider the general reversible reaction. A cap A plus b cap b long left right arrow c cap c plus d cap d What is the equilibrium constant expression for the given system?

Revolt · Accepted Answer

cap k sub e q is equal to the fraction with numerator cap c to the c th power times cap d to the d th power and denominator cap A to the A th power times cap b to the b th power

Question 7

Which represents the correct equilibrium constant expression for the reaction below? Cu times s plus 2 Ag raised to the plus aq power long left right arrow Cu raised to the 2 plus power times aq plus 2 Ag s

Revolt · Accepted Answer

cap k sub e q is equal to the fraction with numerator open paren Cu raised to the 2 plus power close paren and denominator open bracket Ag raised to the plus power close bracket squared

Question 8

Which statement best describes how dynamic equilibrium relates to a saturated solution of sodium chloride?

Revolt · Accepted Answer

Each second, the amount of solid sodium chloride that dissolves equals the amount of solid sodium chloride that recrystallizes.

Question 9

Which statement correctly defines dynamic equilibrium ?

Revolt · Accepted Answer

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

Question 10

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.

Reversible Reactions and Equilibrium — Quiz Answers

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