Zadanie 19
Wzorowane na: Chemistry HL Paper 1, November 2022, pytanie 19. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
Marble chips react with dilute hydrochloric acid. Which combination of changes would decrease the rate of reaction?
A. Concentration of acid increased; marble chips replaced by larger chips
B. Concentration of acid decreased; marble chips replaced by larger chips
C. Concentration of acid decreased; marble chips replaced by powder
D. Concentration of acid increased; marble chips replaced by powder
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
B ✔
«a lower concentration of acid means fewer collisions per unit time, and larger chips have a smaller surface area exposed to the acid; both changes decrease the rate. In the other options at least one change increases it»
Schemat punktowania
One mark for the correct option.