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Comparing Two Products After a Catalyst Change 4 questions
Comparing Two Products After a Catalyst Change
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A model reaction turns each of its starting particles into one of two products. The desired product is P and the other product is Q. All runs start with the same number of particles. The display records both products with and without a catalyst. The two product paths do not reverse in the model.
| Run | P at 10 s | Q at 10 s | P at finish | Q at finish |
|---|---|---|---|---|
| Without catalyst | 20 | 10 | 40 | 30 |
| With catalyst X | 32 | 8 | 56 | 14 |
Question 1
Which comparison shows more total product by 10 s with catalyst X?
- 20 + 10 without X and 32 + 8 with X
- 40 + 30 without X and 56 + 14 with X
- 20 and 40 without X
- 8 and 14 with X
Question 2
Compare the fraction of all final product particles that are P in the two runs.
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Question 3
Use the final records to evaluate the claim that X makes more P only by causing more total starting particles to react.
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A third run with catalyst Y forms 42 total products by 10 s. Its final P and Q counts are 40 and 30, the same as in the run without a catalyst.
Question 4
Which catalyst should the class choose if the goal is to make the most P by the finish? Explain why the early total alone would give the wrong choice.
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