Zadanie 16
Wzorowane na: Chemistry SL Paper 1, May 2023, TZ1, pytanie 16. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
The solid curve in the enthalpy profile below is for a reaction carried out under one set of conditions.
The dashed curve is obtained when the same reaction is carried out with one change. Which change is represented by the dashed curve?
A. A higher concentration of the reactants
B. A higher temperature
C. The reaction is reversed
D. A catalyst is added
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
D ✔
«the dashed curve has a lower activation energy while the reactants and products are at the same enthalpy levels, so ΔH is unchanged: a catalyst provides an alternative pathway with lower Ea. A higher concentration or temperature changes the frequency and energy of the collisions but does not change the profile, and the reverse reaction would start from the products level»
Schemat punktowania
One mark for the correct option.