Zadanie 3c
Wzorowane na: Chemistry SL Paper 2, May 2024, TZ1, pytanie 3(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 3a-3d.
Carbon dioxide can be used to convert methane into synthesis gas, a mixture of carbon monoxide and hydrogen. The process is called dry reforming:
CH4(g) + CO2(g) ⇌ 2 CO(g) + 2 H2(g) ΔH = +246 kJ mol−1
Polecenie
Explain why a higher temperature speeds up this reaction, with the help of annotations that you add to the Maxwell-Boltzmann distribution below, which is drawn for a temperature T1.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
a second curve labelled with a higher temperature T2 > T1, with a lower, broader peak shifted to the right ✔
the activation energy Ea marked as a vertical line on the energy axis ✔
a greater proportion / more particles with kinetic energy ≥ Ea at T2 «so more collisions are successful per unit time» ✔
Schemat punktowania
M1: the higher temperature curve must be identified as the higher temperature (for example T2 > T1). M2: Ea line. M3: a statement that more particles exceed Ea at the higher temperature; accept shading of the area beyond Ea for each curve.