Zadanie 20
Wzorowane na: Chemistry HL Paper 1, May 2024, TZ2, pytanie 20. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
Two gases react very slowly even at 900 K and a high pressure. Which best explains the low rate of reaction?
A. The frequency of collisions between the molecules is low
B. A high fraction of the collisions has the correct orientation
C. The reaction is strongly exothermic
D. The activation energy of the reaction is very high, so very few collisions have enough energy
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
D ✔
«at high temperature and pressure the collisions are frequent and many molecules have high kinetic energy; the rate can be low only if few collisions have energy equal to or greater than the activation energy, that is when the activation energy is very high; the enthalpy change of the reaction does not determine the rate»
Schemat punktowania
One mark for the correct option.