Zadanie 2a
Wzorowane na: Chemistry SL Paper 3, May 2023, TZ1, pytanie 2(a). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Informacja do zadań 2a-2b.
Five divalent metals, P, Q, R, S and T, were each placed in aqueous solutions of the sulfates of the five metals. In the table, "yes" means that a reaction occurred and "no" means that no reaction occurred.
| Metal placed in solution | PSO4(aq) | QSO4(aq) | RSO4(aq) | SSO4(aq) | TSO4(aq) |
|---|---|---|---|---|---|
| P | - | yes | no | yes | no |
| Q | no | - | no | no | no |
| R | yes | yes | - | yes | yes |
| S | no | yes | no | - | no |
| T | yes | yes | no | yes | - |
Polecenie
(i) Identify the oxidation state of metal S in SSO4.
(ii) Deduce the order of reactivity of the five metals, from the most reactive to the least reactive.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
(i) +2 ✔
(ii) R, T, P, S, Q ✔ «R > T > P > S > Q»
Schemat punktowania
(i) [1]: the sign must be included; accept +2 or II, do not accept 2 or 2+. (ii) [1]: the order must be clear; accept the reverse order only if the answer states which end is the most reactive.