- The value of the equilibrium constant for a reaction:
- A) Depends on the initial concentrations of reactants and products
- B) Is always the same at a given temperature
- C) Changes with the presence of a catalyst
- D) Is independent of temperature
- Answer: B) Is always the same at a given temperature
- Which of the following would not cause a shift in equilibrium?
- A) Adding a catalyst
- B) Changing the temperature
- C) Changing the concentration of reactants
- D) Changing the pressure
- Answer: A) Adding a catalyst
- If the reaction quotient Q < K_eq, the reaction will:
- A) Shift to the left
- B) Shift to the right
- C) Remain at equilibrium
- D) Stop
- Answer: B) Shift to the right
- Which of the following is true for a reaction at equilibrium?
- A) The concentrations of reactants and products are equal
- B) The rates of the forward and reverse reactions are equal
- C) The reaction has stopped
- D) The concentrations of reactants and products are zero
- Answer: B) The rates of the forward and reverse reactions are equal
- When a catalyst is added to a reaction at equilibrium, the equilibrium position:
- A) Shifts to the right
- B) Shifts to the left
- C) Does not change
- D) Depends on the concentration of the catalyst
- Answer: C) Does not change
- In a chemical equilibrium involving gases, decreasing the volume of the container will cause the equilibrium to:
- A) Shift toward the side with more moles of gas
- B) Shift toward the side with fewer moles of gas
- C) Not change
- D) Stop the reaction
- Answer: B) Shift toward the side with fewer moles of gas
- If the equilibrium constant K_eq is very large, the reaction:
- A) Favors the formation of products
- B) Favors the formation of reactants
- C) Has no preference
- D) Cannot be determined
- Answer: A) Favors the formation of products
- In an endothermic reaction, increasing the temperature will:
- A) Shift the equilibrium to the right
- B) Shift the equilibrium to the left
- C) Not affect the equilibrium
- D) Increase the concentration of reactants
- Answer: A) Shift the equilibrium to the right
- Which of the following is not a reversible reaction?
- A) N₂ + 3H₂ ⇌ 2NH₃
- B) H₂ + I₂ ⇌ 2HI
- C) NaCl(s) → Na⁺ + Cl⁻
- D) CO₂ + H₂O ⇌ H₂CO₃
- Answer: C) NaCl(s) → Na⁺ + Cl⁻
- At equilibrium, which statement is true about the rates of the forward and reverse reactions?
- A) The forward reaction rate is higher
- B) The reverse reaction rate is higher
- C) Both rates are equal
- D) No reactions occur at equilibrium
- Answer: C) Both rates are equal
