Zadanie 8
Wzorowane na: Chemistry SL Paper 1A, November 2025, TZ3, pytanie 8. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
Which statements about the allotropes of carbon are correct?
I. Graphite conducts electricity because each carbon atom contributes one electron to a delocalized system.
II. Diamond conducts electricity because it has a covalent network structure.
III. Graphene, a single layer of carbon atoms arranged in hexagons, is an electrical conductor.
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
Sprawdź rozwiązanieUkryj rozwiązanieKlucz CKE i punktacja
Odpowiedź z klucza
B ✔
«in diamond every carbon atom uses all four valence electrons in sigma bonds, so there are no mobile electrons and it is an insulator; in graphite and graphene each sp2 carbon atom has one electron in a delocalized pi system that can carry charge»
Schemat punktowania
One mark for the correct option.