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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: CO + 2H₂ ⇌ CH₃OH. The forward reaction is exothermic. 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. If a reversible reaction is exothermic in one direction, it is endothermic in the other.
    • B. In the Haber process, increasing pressure increases the yield of ammonia.
    • C. Changing the conditions can change the position of equilibrium.
    • D. At equilibrium the concentrations of reactants and products are always equal.

  3. Question 3

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

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

  4. Question 4

    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

  5. Question 5

    Equilibrium: which statement is NOT true?

    • A. In the Haber process, increasing pressure increases the yield of ammonia.
    • B. If a reversible reaction is exothermic in one direction, it is endothermic in the other.
    • C. At equilibrium the concentrations of reactants and products are always equal.
    • D. Equilibrium can only be reached in a closed system.

  6. Question 6

    What is true at dynamic equilibrium?

    • A. Both reactions have stopped
    • B. There are equal amounts of reactants and products
    • C. Only the forward reaction happens
    • D. The forward and reverse reactions happen at the same rate

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

  9. Question 9

    Why does a closed system matter for equilibrium?

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

  10. Question 10

    All substances are gases in this equilibrium: CO + 2H₂ ⇌ CH₃OH. The forward reaction is exothermic. 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

  11. Question 11

    Equilibrium: which statement is NOT true?

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

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

  13. Question 13

    All substances are gases in this equilibrium: H₂ + I₂ ⇌ 2HI. 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

  14. Question 14

    Equilibrium: which statement is NOT true?

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

  15. Question 15

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

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

  16. Question 16

    All substances are gases in this equilibrium: CO + 2H₂ ⇌ CH₃OH. The forward reaction is exothermic. 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

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  1. shifts right (more products)
  2. At equilibrium the concentrations of reactants and products are always equal.
  3. none: it only helps equilibrium be reached faster
  4. no change in position
  5. At equilibrium the concentrations of reactants and products are always equal.
  6. The forward and reverse reactions happen at the same rate
  7. no change in position
  8. Reactions stop at equilibrium.
  9. Nothing can enter or leave, so both reactions can balance
  10. shifts right (more products)
  11. Reactions stop at equilibrium.
  12. It is a reversible reaction
  13. shifts right (more products)
  14. A catalyst increases the yield at equilibrium.
  15. none: it only helps equilibrium be reached faster
  16. shifts right (more products)