Zadanie 5d
Wzorowane na: Chemistry HL 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-5f.
Coal is burned in power stations to generate electricity. Coal contains small amounts of sulfur.
Polecenie
A student compares the rate of the reaction between magnesium ribbon and dilute hydrochloric acid at different temperatures by timing how long it takes for a piece of ribbon to dissolve completely.
Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g)
Suggest two variables, other than the concentration of the acid, that should be controlled when comparing the relative rates at different temperatures.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
Any two of:
volume of acid ✔
length / mass / surface area of the magnesium ribbon «same size piece» ✔
same container / apparatus / stirring ✔
Schemat punktowania
[2 max], one mark for each valid variable. Do not accept catalyst, pressure or the time taken, which is the measured quantity.