Zadanie 19
Wzorowane na: Chemistry HL Paper 1, November 2024, pytanie 19. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
Potassium chlorate(V) was heated and the volume of oxygen collected was measured against time. The dotted line shows the result without a catalyst.
The experiment is repeated at the same temperature with the same mass of potassium chlorate(V) and with manganese(IV) oxide added as a catalyst.
Which curve represents the catalysed reaction?
A. Curve A
B. Curve B
C. Curve C
D. Curve D
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
B ✔
«the catalyst gives an alternative pathway with a lower activation energy, so the reaction is faster (a steeper initial slope), but the amount of reactant is the same, so the final volume of oxygen is unchanged; this is curve B»
Schemat punktowania
One mark for the correct option.