Zadanie 1f
Wzorowane na: Chemistry SL Paper 3, May 2023, TZ2, pytanie 1(f). 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
Suggest, giving one reason, whether the volume of a single atom could ever be known exactly.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
no AND an atom has no sharp boundary/the electron density thins out gradually with distance ✔
OR
no AND every measurement carries an uncertainty/an atom is mostly empty space with no definite edge ✔
OR
no AND the size of an atom depends on its chemical environment/state ✔
OR
yes AND the distance between the nuclei of neighbouring atoms can be measured «and used to estimate the size» ✔
Schemat punktowania
[1]: a decision together with a valid reason. A decision without a reason, or a reason that contradicts the decision, earns nothing.