Zadanie 5c
Wzorowane na: Chemistry HL Paper 2, May 2026, TZ1, pytanie 5(c). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Informacja do zadań 5a-5c.
Chlorine dioxide reacts with hydroxide ions in aqueous solution.
2 ClO2(aq) + 2 OH−(aq) → ClO3−(aq) + ClO2−(aq) + H2O(l)
A student measured the initial rate of the reaction in four experiments at constant temperature. The results are shown below.
| Experiment | Initial [OH−] / mol dm−3 | Initial [ClO2] / mol dm−3 | Initial rate / mol dm−3 s−1 |
|---|---|---|---|
| 1 | 0.0200 | 0.0200 | 1.47 × 10−3 |
| 2 | 0.0400 | 0.0200 | 2.95 × 10−3 |
| 3 | 0.0200 | 0.0400 | 5.89 × 10−3 |
| 4 | 0.0200 | 0.0600 | 13.2 × 10−3 |
Polecenie
Calculate the rate constant using the data from experiment 1 and include its units in your answer.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz CKE i punktacja
Odpowiedź z klucza
«» 1.84 × 102 ✔ «184»
«units:» mol−2 dm6 s−1 ✔
Schemat punktowania
[2] M1: k = 184 (1.84 × 10^2), from experiment 1 and the rate equation found in (b); M2: units mol-2 dm6 s-1. Award [1 max] for a calculation that uses the data of experiments 2, 3 or 4. ECF from (b) for M1 and for the units.
Komentarz
The units follow from the overall order (3); check them against the rate equation rather than copying a memorised pattern.