Zadanie 31
Wzorowane na: Chemistry HL Paper 1, May 2023, TZ2, pytanie 31. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
A steel spoon is to be coated with silver by electrolysis. Which arrangement is correct?
A. The spoon is the cathode, a silver rod is the anode and the electrolyte is aqueous AgNO3
B. The spoon is the anode, a silver rod is the cathode and the electrolyte is aqueous AgNO3
C. The spoon is the cathode, a silver rod is the anode and the electrolyte is aqueous CuSO4
D. The spoon is the anode, a graphite rod is the cathode and the electrolyte is aqueous AgNO3
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
A ✔
«reduction occurs at the cathode, so the spoon must be the cathode where Ag+ + e− → Ag; the silver anode dissolves, Ag → Ag+ + e−, replacing the silver ions used, and the electrolyte must contain silver ions. B and D reverse the electrodes, and C would deposit copper»
Schemat punktowania
One mark for the correct option.