Zadanie 4c
Wzorowane na: Chemistry HL Paper 3, November 2024, pytanie 4(c). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
Nylon-6,6 is a polyamide used to make strong fibres. A section of one chain is shown; asterisks indicate continuation bonds.
Compare and contrast the bonding and the intermolecular forces in nylon-6,6 and in graphite.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
both have covalent bonds within the chains/layers «and covalent bonds are not broken when the material is stretched/sheared» ✔
nylon-6,6 has hydrogen bonds between chains AND graphite has only London/dispersion forces between layers ✔
graphite has only C–C bonds «with delocalized electrons» AND nylon-6,6 also has C–H, C–N, N–H and C=O bonds, some of them polar ✔
Schemat punktowania
Award [1] for each marking point. Accept 'graphite has only non-polar covalent bonds, nylon has polar covalent bonds as well' for M3.
Komentarz
Carbon nanotubes are not named in the 2023 guide, so the comparison is made with graphite (S2.2.7) instead.