Zadanie 14a
Wzorowane na: Chemistry HL Paper 3, May 2024, TZ1, pytanie 14(a). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
Natural gas, which is mainly methane, and coal, which is mainly carbon, are both burned in power stations.
Outline why burning natural gas has a lower environmental impact than burning coal.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
natural gas produces less carbon dioxide per unit of energy released ✔ «for example 891 kJ released per mole of CO2 compared with 394 kJ for carbon»
natural gas produces fewer pollutants/less soot/particulates/carbon monoxide/sulfur dioxide ✔
Schemat punktowania
M1: the comparison must be per unit of energy; do not accept "methane produces less carbon dioxide" alone. M2: accept coal undergoes incomplete combustion more readily, or coal contains sulfur that forms acid rain.