Zadanie 4a
Wzorowane na: Chemistry HL Paper 3, November 2023, TZ2, pytanie 4(a). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
A student electrolysed aqueous silver nitrate between two silver electrodes, as shown. Each electrode was washed, dried and weighed before and after the electrolysis.
Suggest why the mass gained by the cathode is a less accurate measure of the amount of silver transferred than the mass lost by the anode.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
some of the deposited silver is not firmly attached and drops off the cathode during the electrolysis
OR
some of the loose silver deposit is rubbed or washed off while the cathode is rinsed and dried ✔
Schemat punktowania
Award [1]. The answer must refer to the cathode. Accept "deposit is loose/powdery" only with a consequence for the mass.