Zadanie 1
Wzorowane na: Chemistry HL Paper 1, May 2023, TZ1, pytanie 1. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
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Polecenie
Hydrogen peroxide has the molecular formula H2O2. Which statement about this formula is correct?
A. It shows that the two oxygen atoms are joined by a double bond
B. It is the same as the empirical formula of hydrogen peroxide
C. It shows that one mole of the compound contains two molecules
D. It shows that every molecule contains two hydrogen atoms and two oxygen atoms
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
D ✔
«a molecular formula gives the actual number of atoms of each element in one molecule; the empirical formula of hydrogen peroxide is HO, bond types are not shown by a molecular formula, and one mole contains 6.02 × 1023 molecules»
Schemat punktowania
One mark for the correct option.