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Separating Two Effects on an Initial Rate 4 questions
Separating Two Effects on an Initial Rate
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A reaction simulation uses dissolved reactants R and S. Each trial is at the same temperature and total volume. The display measures the initial rate of product formation before either reactant is used up appreciably.
| Trial | R concentration (model units) | S concentration (model units) | Initial rate (product units/s) |
|---|---|---|---|
| A | 1 | 1 | 4 |
| B | 2 | 1 | 8 |
| C | 1 | 2 | 16 |
| D | 2 | 2 | 32 |
Question 1
Which pair isolates the effect of changing S while R remains at 2 model units?
- A and B
- A and C
- B and C
- B and D
Question 2
Use A, B, and C to compare the observed effect of doubling R with that of doubling S.
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Question 3
A student says A and D alone prove that S has a greater effect than R. Select whether the comparison supports or refutes that claim, and explain.
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The class adds a trial E with R at 4 units and S at 1 unit. It predicts that each doubling of R has the same effect while S is fixed at 1.
Question 4
Predict the initial rate for E under that hypothesis. Explain which existing pair supports the prediction.
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