Question

Last Question from Lesson 6.2 material. Again, using the Haber Process, determine which hypotheses could be "supported" and which would be "rejected" by the direct observations that resulted in this graph.

Each model hypothesis will only fit into one category. Here is the graph again to help you.



(4 points)
Accept Hypothesis Reject Hypothesis
Increasing ammonia production requires an increase in temperature.


As pressure increases, percentage yield of ammonia increases because the number of particles collisions increase.


Percentage yield will increase if pressure is increased and temperature is decreased.


Increasing temperature and decreasing pressure will result in higher ammonia production.


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Answer 1

Accept Hypothesis
- As pressure increases, percentage yield of ammonia increases because the number of particle collisions increase.
- Percentage yield will increase if pressure is increased and temperature is decreased.

Reject Hypothesis
- Increasing ammonia production requires an increase in temperature.
- Increasing temperature and decreasing pressure will result in higher ammonia production.

Reason: The Haber equilibrium (N2 + 3H2 ⇌ 2NH3) is exothermic, so lower temperature and higher pressure favor ammonia formation. The graph’s observations (yield up with pressure, down with temperature) support the two statements consistent with that and reject the two that predict the opposite.