Zadanie 22
Wzorowane na: Chemistry SL Paper 1A, November 2025, TZ3, pytanie 22. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
A sealed glass tube contains solid iodine in equilibrium with iodine vapour at constant temperature.
Which of the following could be observed?
A. The purple colour of the vapour gradually becomes more intense
B. The total mass of the solid decreases steadily until no solid remains
C. Individual crystals change shape while the total mass of solid stays constant
D. The pressure inside the tube rises continuously
Sprawdź rozwiązanieUkryj rozwiązanieKlucz CKE i punktacja
Odpowiedź z klucza
C ✔
«at equilibrium the rates of sublimation and deposition are equal, so the macroscopic properties (vapour colour, pressure, total mass of solid) stay constant; both processes continue at the particle level, so individual crystals can lose and gain iodine molecules and slowly change shape»
Schemat punktowania
One mark for the correct option.