Zadanie 6c
Wzorowane na: Chemistry HL Paper 2, May 2026, TZ2, pytanie 6(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 6a-6c.
Nitrogen(II) oxide reacts with chlorine in the gas phase at constant temperature.
2 NO(g) + Cl2(g) → 2 NOCl(g)
Initial rates of reaction were measured using different initial concentrations of the reactants.
| [NO] / mol dm−3 | [Cl2] / mol dm−3 | Initial rate / mol dm−3 s−1 |
|---|---|---|
| 1.0 × 10−2 | 4.0 × 10−3 | 8.0 × 10−5 |
| 2.0 × 10−2 | 4.0 × 10−3 | 3.2 × 10−4 |
| 2.0 × 10−2 | 2.0 × 10−3 | 1.6 × 10−4 |
Polecenie
Outline how the activation energy, Ea, of this reaction could be found, without describing the apparatus or the procedure.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz CKE i punktacja
Odpowiedź z klucza
measure the rate constant / initial rate at different temperatures ✔
ALTERNATIVE 1:
plot a graph of ln k against 1/T ✔
gradient = −Ea/R ✔
ALTERNATIVE 2:
write the Arrhenius equation for two pairs of values (k1, T1) and (k2, T2) ✔
solve the pair of equations for Ea ✔
Schemat punktowania
[3] M1 rate constants at different temperatures; M2 and M3 either alternative; accept a suitable diagram for M2 and M3 in alternative 1.