Dynamic Equilibria Quiz
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5 questions, one answer each
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1. What does the symbol ⇌ in the Haber process equation represent?
- A. A precipitation reaction
- B. A reversible reaction
- C. An irreversible reaction
- D. A catalytic reaction only
2. What is meant by dynamic equilibrium?
- A. The reaction has completely stopped
- B. The forward and reverse reactions occur at the same rate, so concentrations stay constant
- C. Only the forward reaction is occurring
- D. The temperature and pressure are constant
3. What are the standard conditions used in the Haber process?
- A. 25 degC, 1 atmosphere, no catalyst
- B. 450 degC, 200 atmospheres, iron catalyst
- C. 1000 degC, 1 atmosphere, platinum catalyst
- D. 450 degC, 1 atmosphere, iron catalyst
4. Why is 200 atmospheres pressure used in the Haber process rather than an even higher pressure?
- A. Higher pressure would decrease yield
- B. Very high pressures are expensive and difficult to generate and maintain safely, so 200 atmospheres is a practical compromise
- C. Pressure has no effect on the reaction
- D. The catalyst only works at exactly 200 atmospheres
5. A factory manager wants to increase ammonia production without changing temperature or pressure. Which change would help, and why?
- A. Add a catalyst, because it shifts equilibrium towards more ammonia
- B. Add a catalyst, because it makes equilibrium (and therefore useful output) reached faster without changing the yield
- C. Remove the catalyst, to allow more ammonia to accumulate
- D. Lower the pressure, since gas volume does not matter