Zadanie 2a
Wzorowane na: Chemistry SL Paper 2, November 2024, pytanie 2(a). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
In the solid state, calcium, Ca, and calcium chloride, CaCl2, are each built as a regular three-dimensional lattice.
Predict the electrical conductivity of Ca(s) and of CaCl2(s), giving a reason for each.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
Ca(s): high conductivity / conducts AND delocalized electrons are free to move ✔
CaCl2(s): low conductivity / does not conduct AND ions are fixed in position in the lattice ✔
Schemat punktowania
M1: Ca(s); M2: CaCl2(s). The words "metal" or "metallic bonding" on their own do not explain the conductivity (M1). Mobile electrons are not an acceptable reason for M2. When both predictions are right but no reasons are given, award [1] at most.