Zadanie 3a
Wzorowane na: Chemistry HL Paper 2, May 2026, TZ3, pytanie 3(a). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Informacja do zadań 3a-3e.
Metals and their compounds are used in construction, in batteries and as pigments.
Polecenie
Silver has two stable and abundant isotopes. Its relative atomic mass is 107.87.
| Isotope | Relative isotopic mass |
|---|---|
| Ag-107 | 106.91 |
| Ag-109 | 108.90 |
(i) Determine the percent abundance of each isotope, showing your working.
(ii) State the number of protons, neutrons and electrons in .
Sprawdź rozwiązanieUkryj rozwiązanieKlucz CKE i punktacja
Odpowiedź z klucza
(i) «let x be the fraction of Ag-107:» 106.91x + 108.90(1 − x) = 107.87
OR
✔
Ag-107: 51.8 % AND Ag-109: 48.2 % ✔
(ii) protons 47 AND neutrons 62 AND electrons 46 ✔
Schemat punktowania
(i) Award [2] for the correct final answer with working (accept 52 % and 48 %); [1 max] for 0.518 and 0.482 as fractions or for a correct equation with a wrong solution. (ii) [1]: all three numbers must be correct.