Zadanie 15b
Wzorowane na: Chemistry HL Paper 3, November 2023, TZ1, pytanie 15(b). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Informacja do zadań 15a-15b.
Electrochemical cells convert chemical energy into electrical energy.
Polecenie
Describe, in detail, how a hydrogen–oxygen fuel cell and a secondary cell can each be used again and again without being replaced.
Fuel cell:
Secondary cell:
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
Fuel cell: it is continuously/repeatedly supplied with fresh fuel/hydrogen «and oxygen» ✔
Secondary cell: it is recharged by passing a current from an external source/power supply through it, which reverses the cell reactions ✔
Schemat punktowania
M1: the fuel cell is re-supplied with fuel. M2: the secondary cell is recharged using an external electrical source that reverses the reactions. Award [1 max] if the two terms 'refuelled' and 'recharged' are given without the detail.