Reversible reactions and equilibrium Quiz
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5 questions, one answer each
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1. In a closed system at dynamic equilibrium, which statement is true?
- A. The forward reaction has stopped
- B. The concentrations of reactants and products are equal
- C. The forward and reverse reactions happen at the same rate
- D. The reverse reaction is faster than the forward reaction
2. The reaction A(g) + B(g) ⇌ 2C(g) is at equilibrium. More A is added. What happens to the position of equilibrium?
- A. It shifts to the right
- B. It shifts to the left
- C. It does not change
- D. The reaction stops
3. N₂(g) + 3H₂(g) ⇌ 2NH₃(g) has 4 gas molecules on the left and 2 on the right. What does increasing the pressure do?
- A. Lowers the yield of ammonia
- B. Has no effect on the yield
- C. Stops the reaction
- D. Increases the yield of ammonia
4. Why is an iron catalyst used in the Haber process?
- A. To increase the yield of ammonia
- B. To speed up the reaction so equilibrium is reached faster
- C. To make the reaction endothermic
- D. To remove the ammonia
5. A reaction is exothermic in the forward direction. What happens to the yield of products if the temperature is raised?
- A. It increases
- B. It does not change
- C. It decreases
- D. It doubles