Zadanie 22
Wzorowane na: Chemistry SL Paper 1, May 2024, TZ1, pytanie 22. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
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Polecenie
Which statement is correct for a voltaic cell made from a zinc half-cell and a copper half-cell? The standard electrode potential of the zinc half-cell is more negative than that of the copper half-cell.
A. Zinc is the cathode.
B. Electrons flow through the external circuit from the copper electrode to the zinc electrode.
C. The mass of the copper electrode decreases as the cell operates.
D. Copper(II) ions are reduced at the copper electrode.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
D ✔
«in the spontaneous reaction zinc is oxidized at the anode (negative electrode), electrons flow through the wire from zinc to copper, and Cu2+ ions are reduced at the copper cathode, Cu2+ + 2 e− → Cu, so the copper electrode gains mass»
Schemat punktowania
One mark for the correct option.