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Predict how an equilibrium shifts (Le Chatelier)

10th grade (Year 11 in England) · 16 questions · Common Core: NGSS.HS-PS1-6 · England: GCSE Combined Science: The rate and extent of chemical change (Higher)

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  1. Question 1

    All substances are gases in this equilibrium: N₂O₄ ⇌ 2NO₂. The forward reaction is endothermic. More of the first reactant is added. What happens to the position of equilibrium?

    • A. shifts right (more products)
    • B. shifts left (more reactants)
    • C. no change in position

  2. Question 2

    Equilibrium: which statement is NOT true?

    • A. Reactions stop at equilibrium.
    • B. Equilibrium can only be reached in a closed system.
    • C. Changing the conditions can change the position of equilibrium.
    • D. If a reversible reaction is exothermic in one direction, it is endothermic in the other.

  3. Question 3

    What effect does a catalyst have on the position of equilibrium?

    • A. it stops the reverse reaction
    • B. it shifts it left
    • C. it shifts it right
    • D. none: it only helps equilibrium be reached faster

  4. Question 4

    All substances are gases in this equilibrium: N₂O₄ ⇌ 2NO₂. The forward reaction is endothermic. More of the first reactant is added. What happens to the position of equilibrium?

    • A. shifts right (more products)
    • B. shifts left (more reactants)
    • C. no change in position

  5. Question 5

    Equilibrium: which statement is NOT true?

    • A. Reactions stop at equilibrium.
    • B. If a reversible reaction is exothermic in one direction, it is endothermic in the other.
    • C. In the Haber process, increasing pressure increases the yield of ammonia.
    • D. Equilibrium can only be reached in a closed system.

  6. Question 6

    Why does a closed system matter for equilibrium?

    • A. It makes the reaction irreversible
    • B. It keeps the system warm
    • C. It adds a catalyst
    • D. Nothing can enter or leave, so both reactions can balance

  7. Question 7

    All substances are gases in this equilibrium: H₂ + I₂ ⇌ 2HI. The pressure is increased. What happens to the position of equilibrium?

    • A. shifts right (more products)
    • B. shifts left (more reactants)
    • C. no change in position

  8. Question 8

    Equilibrium: which statement is NOT true?

    • A. In the Haber process, increasing pressure increases the yield of ammonia.
    • B. Changing the conditions can change the position of equilibrium.
    • C. At equilibrium the concentrations of reactants and products are always equal.
    • D. Equilibrium can only be reached in a closed system.

  9. Question 9

    Heating blue hydrated copper sulfate makes white anhydrous copper sulfate and water. Adding water turns it blue again. What does this show?

    • A. Water is a catalyst
    • B. It is a reversible reaction
    • C. Copper sulfate is an element
    • D. It is a physical change only

  10. Question 10

    All substances are gases in this equilibrium: N₂O₄ ⇌ 2NO₂. The forward reaction is endothermic. Product is removed as it forms. What happens to the position of equilibrium?

    • A. shifts right (more products)
    • B. shifts left (more reactants)
    • C. no change in position

  11. Question 11

    Equilibrium: which statement is NOT true?

    • A. At equilibrium the concentrations of reactants and products are always equal.
    • B. If a reversible reaction is exothermic in one direction, it is endothermic in the other.
    • C. Equilibrium can only be reached in a closed system.
    • D. Changing the conditions can change the position of equilibrium.

  12. Question 12

    Heating blue hydrated copper sulfate makes white anhydrous copper sulfate and water. Adding water turns it blue again. What does this show?

    • A. Copper sulfate is an element
    • B. Water is a catalyst
    • C. It is a reversible reaction
    • D. It is a physical change only

  13. Question 13

    All substances are gases in this equilibrium: N₂ + 3H₂ ⇌ 2NH₃. The forward reaction is exothermic. Product is removed as it forms. What happens to the position of equilibrium?

    • A. shifts right (more products)
    • B. shifts left (more reactants)
    • C. no change in position

  14. Question 14

    Equilibrium: which statement is NOT true?

    • A. If a reversible reaction is exothermic in one direction, it is endothermic in the other.
    • B. A catalyst increases the yield at equilibrium.
    • C. Changing the conditions can change the position of equilibrium.
    • D. In the Haber process, increasing pressure increases the yield of ammonia.

  15. Question 15

    Why does a closed system matter for equilibrium?

    • A. It makes the reaction irreversible
    • B. Nothing can enter or leave, so both reactions can balance
    • C. It keeps the system warm
    • D. It adds a catalyst

  16. Question 16

    All substances are gases in this equilibrium: H₂ + I₂ ⇌ 2HI. The pressure is decreased. What happens to the position of equilibrium?

    • A. shifts right (more products)
    • B. shifts left (more reactants)
    • C. no change in position

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Answer key: Predict how an equilibrium shifts (Le Chatelier)

  1. 1. A. shifts right (more products)

  2. 2. A. Reactions stop at equilibrium.

  3. 3. D. none: it only helps equilibrium be reached faster

  4. 4. A. shifts right (more products)

  5. 5. A. Reactions stop at equilibrium.

  6. 6. D. Nothing can enter or leave, so both reactions can balance

  7. 7. C. no change in position

  8. 8. C. At equilibrium the concentrations of reactants and products are always equal.

  9. 9. B. It is a reversible reaction

  10. 10. A. shifts right (more products)

  11. 11. A. At equilibrium the concentrations of reactants and products are always equal.

  12. 12. C. It is a reversible reaction

  13. 13. A. shifts right (more products)

  14. 14. B. A catalyst increases the yield at equilibrium.

  15. 15. B. Nothing can enter or leave, so both reactions can balance

  16. 16. C. no change in position