Zadanie 2a
Wzorowane na: Chemistry HL Paper 2, November 2023, TZ1, pytanie 2(a). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Informacja do zadań 2a-2g.
Hydrogen iodide forms from its elements in the gas phase according to the equilibrium
H2(g) + I2(g) ⇌ 2 HI(g)
Polecenie
Hydrogen iodide is an intermediate in some thermochemical cycles that are being researched as a way of obtaining hydrogen from water without using fossil fuels. Explain why there is great interest in producing hydrogen in this way.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
hydrogen is a clean fuel: it burns / reacts in a fuel cell to form only water AND no carbon dioxide ✔
producing hydrogen from fossil fuels releases carbon dioxide «a greenhouse gas that contributes to global warming / climate change», so a route that does not use them avoids this ✔
OR
water is a «renewable» raw material, whereas fossil fuels are finite / non-renewable ✔
Schemat punktowania
[1] for each of two different points. Accept “reduces carbon dioxide emissions” for M2. Accept “hydrogen has a high energy density per unit mass” for M1 when a fuel use is mentioned.