Zadanie 11c
Wzorowane na: Chemistry SL Paper 3, November 2023, TZ2, pytanie 11(c). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
Outline one advantage and one disadvantage, apart from cost, of using natural gas rather than coal as the fuel in a power station.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
Advantage, any one of:
less carbon dioxide produced per unit of energy released ✔
burns more cleanly, giving less soot, ash or solid waste ✔
higher specific energy ✔
Disadvantage, any one of:
methane/CH4 is a greenhouse gas that escapes if there are leaks ✔
highly flammable/explosive «if it accumulates» ✔
difficult to detect leaks/odourless ✔
has to be transported under pressure or liquefied, needing special pipelines/tankers ✔
Schemat punktowania
Award [1] for a correct advantage and [1] for a correct disadvantage. Reject vague wording ("cleaner", "less pollution", "hazardous"). The opposite of the stated advantage cannot be used as the disadvantage. Properties shared with coal (releases carbon dioxide, non-renewable) are not disadvantages relative to coal.