AP Chemistry
5.11 Catalysis
5.6 Reaction Energy Profile
The decomposition of hydrogen peroxide is represented by the following equation.
\(2\text{H}_2\text{O}_2\text{(aq)} \rightarrow 2\text{H}_2\text{O(l)} + \text{O}_2\text{(g)}\)
A student performs three trials at the same temperature using the same initial amount and concentration of \(\text{H}_2\text{O}_2\text{(aq)}\). The student records the following data.
Additional tests show that \(\text{I}^-\text{(aq)}\) is regenerated during trial 2 and that the solid in trial 3 can be recovered unchanged. Which statement correctly classifies the two catalysts and explains the shorter collection times?
\(2\text{H}_2\text{O}_2\text{(aq)} \rightarrow 2\text{H}_2\text{O(l)} + \text{O}_2\text{(g)}\)
A student performs three trials at the same temperature using the same initial amount and concentration of \(\text{H}_2\text{O}_2\text{(aq)}\). The student records the following data.
| Trial | Substance added | Time to collect \(20.0 \text{ mL}\) of \(\text{O}_2\text{(g)}\) |
|---|---|---|
| 1 | None | \(160 \text{ s}\) |
| 2 | \(\text{KI(aq)}\), a source of \(\text{I}^-\text{(aq)}\) | \(40 \text{ s}\) |
| 3 | \(\text{MnO}_2\text{(s)}\) | \(30 \text{ s}\) |
Additional tests show that \(\text{I}^-\text{(aq)}\) is regenerated during trial 2 and that the solid in trial 3 can be recovered unchanged. Which statement correctly classifies the two catalysts and explains the shorter collection times?
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