Zadanie 1c
Wzorowane na: Chemistry SL Paper 3, May 2023, TZ2, pytanie 1(c). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Informacja do zadań 1a-1f.
The atomic volume of an element is defined by the formula
The table gives the atomic volumes of the elements with atomic numbers 5 to 19, in the form in which each occurs at STP. For an element that is a gas, the value is the volume occupied by one mole of its atoms. Where an element has a second form at STP, the atomic volume of that form is given in the last column.
| Atomic number | Atomic volume / cm3 mol−1 | Second form at STP / cm3 mol−1 |
|---|---|---|
| 5 | 4.62 | n/a |
| 6 | 5.30 | 3.42 |
| 7 | 11 350 | n/a |
| 8 | 11 350 | 7 570 |
| 9 | 11 350 | n/a |
| 10 | 22 700 | n/a |
| 11 | 23.8 | n/a |
| 12 | 14.0 | n/a |
| 13 | 9.99 | n/a |
| 14 | 12.1 | n/a |
| 15 | 17.0 | 14.1 |
| 16 | 15.5 | 16.4 |
| 17 | 11 350 | n/a |
| 18 | 22 700 | n/a |
| 19 | 45.4 | n/a |
Polecenie
Phosphorus and oxygen each have a second value in the last column of the table. Suggest why a single element can have two different atomic volumes.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
«different» allotropes ✔
«the element exists in more than one structural form, for example white and red phosphorus, or O2 and O3»
Schemat punktowania
[1]: allotropes, that is different structural forms of the same element (for example different molecules or networks). Accept correct formulas or names of allotropes, such as O2 and O3. "Isotopes" alone earns nothing.