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Checking a Reusable Catalyst After Rinsing 4 questions
Checking a Reusable Catalyst After Rinsing
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A classroom simulation follows the decomposition of hydrogen peroxide. Each run starts with the same amount of hydrogen peroxide at the same temperature. The simulation records oxygen gas volume at the same pressure and temperature. In some runs the model puts a solid catalyst in contact with the solution.
2H2O2(aq) → 2H2O(l) + O2(g)
| Run | Oxygen after 30 s (mL) | Oxygen after reaction ends (mL) |
|---|---|---|
| No catalyst | 4 | 40 |
| Clean catalyst | 24 | 40 |
| Used catalyst | 10 | 40 |
| Used catalyst after rinsing | 22 | 40 |
Question 1
Use one pair of results to explain how the clean catalyst changes the rate without changing the amount of oxygen produced when the reaction ends.
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Question 2
Which comparison gives the most direct evidence that rinsing the used catalyst can restore much of its early effect?
- No catalyst and clean catalyst
- No catalyst and used catalyst
- Used catalyst and used catalyst after rinsing
- Clean catalyst and used catalyst
Question 3
According to the equation, how many moles of hydrogen peroxide react for every 0.015 mol of oxygen produced? Show the mole ratio.
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A student proposes that handling and moving the used solid, by itself, could change its early effect. The class can split a comparable used sample into two portions.
Question 4
Describe how to use the two portions to separate the effect of rinsing from the effect of handling. State what result to compare.
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