Zadanie 38
Wzorowane na: Chemistry HL Paper 1, November 2023, TZ1, pytanie 38. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
A fixed amount of magnesium reacts with hydrochloric acid, which is added in increasing amounts. After each addition the reaction is allowed to finish.
Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g)
Which graph shows how the amount of hydrogen formed changes with the amount of hydrochloric acid added?
A. Graph A
B. Graph B
C. Graph C
D. Graph D
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
C ✔
«while the acid is limiting, the amount of H2 is proportional to the amount of HCl (a straight line through the origin); once all the magnesium has reacted it is the limiting reactant, so extra acid forms no more hydrogen and the graph is constant»
Schemat punktowania
One mark for the correct option.