Zadanie 3b
Wzorowane na: Chemistry SL Paper 2, May 2022, TZ1, pytanie 3(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 3a-3f.
Zinc is a reactive metal found in alloys such as brass. Magnesium is another reactive metal, and its organometallic compounds are widely used in organic synthesis.
Polecenie
Suggest an experiment that shows that zinc is more reactive than copper, giving the observation that would confirm this.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
Alternative 1
place zinc in copper(II) sulfate solution / Cu2+(aq) ✔
the blue colour fades AND/OR reddish-brown copper forms on the zinc ✔
Alternative 2
add both metals to dilute hydrochloric acid ✔
bubbles form on zinc AND no bubbles form on copper ✔
Alternative 3
construct a cell with zinc and copper electrodes ✔
voltmeter shows a positive reading / bulb lights / electrons flow from zinc to copper / zinc electrode decreases in mass ✔
Schemat punktowania
[1] for a suitable experiment and [1] for the observation that goes with it; the observation must match the experiment chosen. If the answer only states that copper does not react in Zn2+(aq), award [1] in total. Accept other correct methods.