Equilibria and Organic Chemistry Quiz

What happens in a dynamic equilibrium?

• Reactants and products are formed at equal rates

• Reactants are converted completely into products

• No reaction occurs

• Reactants only partially react

Which statement is true about dynamic equilibrium in a closed system?

• Reactant concentrations increase over time

• Product concentrations decrease over time

• Concentrations of reactants and products remain constant

• Only reactants are present

What condition is essential for dynamic equilibrium?

• High temperature

• Low pressure

• A closed system

• Large surface area

What happens to the rate of reaction at equilibrium?

• It increases

• It decreases

• Forward and backward rates become equal

• Forward and backward rates stop completely

What does not change at equilibrium?

• Reactant concentration

• Product concentration

• System temperature

• All of the above

What does the equilibrium constant (K) represent?

• Ratio of product concentration to reactant concentration

• Rate of reaction

• Temperature at equilibrium

• Pressure at equilibrium

What does a large equilibrium constant (K) indicate?

• Reactants are favored

• Products are favored

• Reaction occurs slowly

• Reaction is reversible

What is the equilibrium constant for the reaction: A + B ↔ C + D?

• [A][B] / [C][D]

• [C][D] / [A][B]

• [A]/[B][C][D]

• [C]/[A][B][D]

How does temperature affect the equilibrium constant?

• It always decreases K

• It always increases K

• It depends on whether the reaction is endothermic or exothermic

• It has no effect

Which factor does not influence the equilibrium constant?

• Pressure

• Temperature

• Concentration of reactants

• Catalyst presence