Zadanie 19

1 pktzamknięteśrednie (szac.)Paper 1A, listopad 2025, TZ3

Wzorowane na: Chemistry SL Paper 1A, November 2025, TZ3, pytanie 19. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.

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Polecenie

Equal volumes of nitrogen and hydrogen are mixed and react according to the equation below. The volumes of the two reactants are measured at intervals.

N2(g) + 3 H2(g) → 2 NH3(g)

Which graph shows how the volumes of the two reactants change with time?

graph A of the volumes of N2 and H2 against time
graph B of the volumes of N2 and H2 against time
graph C of the volumes of N2 and H2 against time
graph D of the volumes of N2 and H2 against time

A. Graph A

B. Graph B

C. Graph C

D. Graph D

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Odpowiedź z klucza

D ✔

«both reactants are used up, hydrogen three times as fast as nitrogen (mole ratio 1 : 3); with equal starting volumes hydrogen is the limiting reactant and runs out when one third of the nitrogen has reacted, so the nitrogen curve levels off at two thirds of its initial value; both curves flatten as the rate falls»

Schemat punktowania

One mark for the correct option.

Komentarz

The reactant with the larger stoichiometric coefficient is consumed faster; with equal starting volumes it is also the one that runs out.

Umiejętności w zadaniu