Zadanie 23
Wzorowane na: Chemistry SL Paper 1, November 2023, TZ1, pytanie 23. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
A voltaic cell is set up with the cell diagram and a salt bridge containing aqueous potassium nitrate. Which statements are correct while the cell operates?
I. The mass of the silver electrode increases.
II. NO3− ions in the salt bridge move towards the silver half-cell.
III. Electrons flow through the external circuit from the zinc electrode to the silver electrode.
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
B ✔
«zinc is oxidized at the anode and silver ions are reduced at the cathode (Ag+ + e− → Ag), so silver is deposited and its mass increases (I) and electrons flow from zinc to silver (III); anions in the salt bridge move towards the anode, the zinc half-cell, so II is false»
Schemat punktowania
One mark for the correct option.