Zadanie 5d
Wzorowane na: Chemistry SL Paper 2, November 2022, pytanie 5(d). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Informacja do zadań 5a-5d.
Coal is burned in power stations to generate electricity. Coal contains small amounts of sulfur.
Polecenie
Coal-fired power stations release carbon dioxide and sulfur oxides. Discuss two different measures that could reduce the environmental impact of generating electricity from coal.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
Any two of:
remove sulfur from the coal before burning «washing, use of low-sulfur coal» ✔
add limestone / lime during combustion or treat the flue gases to remove sulfur oxides «desulfurization» ✔
prevent carbon dioxide from reaching the atmosphere «carbon capture and storage» ✔
reduce the proportion of electricity generated from coal, e.g. replace it with natural gas or renewable sources ✔
improve the efficiency of energy production from coal so that less coal is burned ✔
Schemat punktowania
[2 max]. Each measure must be distinct and must be linked to a reduced environmental effect («discuss» asks for the benefit as well as the measure). Do not accept measures that only reduce emissions from other fuels.