- What is chemical equilibrium?
- A) The point at which reactants are completely converted to products
- B) The point at which the rate of the forward reaction equals the rate of the reverse reaction
- C) The point at which all reactions stop
- D) The point at which only the reverse reaction occurs
- Answer: B) The point at which the rate of the forward reaction equals the rate of the reverse reaction
- At equilibrium, the concentrations of reactants and products:
- A) Continue to change
- B) Are always equal
- C) Remain constant
- D) Become zero
- Answer: C) Remain constant
- Which of the following is a characteristic of chemical equilibrium?
- A) The forward and reverse reactions occur at different rates
- B) The amounts of reactants and products are always equal
- C) The concentrations of reactants and products remain constant
- D) No reactions occur at equilibrium
- Answer: C) The concentrations of reactants and products remain constant
- The equilibrium constant is represented by which symbol?
- A) K
- B) Q
- C) ΔG
- D) K_eq
- Answer: D) K_eq
- If K_eq > 1, the equilibrium favors:
- A) Reactants
- B) Products
- C) Both reactants and products equally
- D) Neither reactants nor products
- Answer: B) Products
- Which of the following does not affect the position of equilibrium?
- A) Temperature
- B) Concentration
- C) Pressure
- D) Catalyst
- Answer: D) Catalyst
- Le Chatelier’s principle states that:
- A) The equilibrium constant will change with temperature
- B) A system at equilibrium will remain at equilibrium if undisturbed
- C) A system at equilibrium will shift to counteract any changes
- D) The forward reaction will always be favored
- Answer: C) A system at equilibrium will shift to counteract any changes
- Increasing the concentration of reactants will cause the equilibrium to:
- A) Shift to the left
- B) Shift to the right
- C) Not change
- D) Stop
- Answer: B) Shift to the right
- In a reversible reaction, if the temperature is increased for an exothermic reaction, the equilibrium will:
- A) Shift to the right
- B) Shift to the left
- C) Not change
- D) Increase the rate of reaction only
- Answer: B) Shift to the left
- The effect of pressure on equilibrium is most significant in reactions involving:
- A) Solids only
- B) Liquids only
- C) Gases
- D) Aqueous solutions
- Answer: C) Gases
