The Effect of Changing Temperature Quiz
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5 questions, one answer each
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1. If temperature is raised on a reversible reaction, what happens to the yield of the endothermic direction?
- A. It decreases
- B. It increases
- C. It stays the same
- D. It becomes zero
2. If temperature is lowered, the yield of which direction increases?
- A. The endothermic direction
- B. The exothermic direction
- C. Neither direction changes
- D. Both directions increase equally
3. The forward reaction of the Haber process is exothermic. Why is a moderate temperature (~450°C) used instead of a very low one that would give a higher yield?
- A. Low temperature destroys the catalyst
- B. A very low temperature would make the rate of reaction too slow
- C. Low temperature prevents nitrogen and hydrogen reacting at all
- D. Ammonia cannot exist at low temperatures
4. Which statement correctly distinguishes the effect of raising temperature on rate versus yield?
- A. Raising temperature always increases both rate and yield
- B. Raising temperature always increases rate, but only increases yield of the endothermic direction
- C. Raising temperature always decreases rate and yield
- D. Raising temperature has no effect on rate, only on yield
5. A reversible reaction has an exothermic forward direction. A chemist wants to maximise the yield of product while keeping a reasonably fast reaction rate. What temperature strategy best achieves this?
- A. Use the highest possible temperature
- B. Use the lowest possible temperature only
- C. Use a moderate, compromise temperature that is not too low (to keep a reasonable rate) but not too high (to avoid excessive loss of yield)
- D. Temperature has no effect, so any temperature will do