Zadanie 3b
Wzorowane na: Chemistry HL Paper 3, November 2023, TZ2, pytanie 3(b). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
Graphite foil is made of many layers of carbon atoms stacked on top of each other. It is used to spread heat away from the processor of a mobile phone because it conducts heat well parallel to the layers but poorly perpendicular to them.
Suggest why graphite foil is a good conductor of heat parallel to the layers but a poor conductor of heat perpendicular to the layers.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
Good conductor parallel to the layers:
delocalized electrons can move through each layer
OR
atoms in a layer are covalently bonded in a continuous network ✔
Poor conductor perpendicular to the layers:
no delocalized electrons between layers
OR
layers are held together only by weak London/dispersion forces/atoms in different layers are not bonded ✔
Schemat punktowania
Award [1] for each correct explanation. The explanation must refer to both directions.