Zadanie 1e
Wzorowane na: Chemistry HL Paper 2, May 2022, TZ1, pytanie 1(e). 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-1g.
Calcium turnings burn in air to form mainly calcium oxide, CaO. A small amount of calcium nitride, Ca3N2, is also formed according to the equation:
3 Ca(s) + N2(g) → Ca3N2(s)
Polecenie
Most oxide ions are .
(i) State the number of protons, neutrons and electrons in this ion.
(ii) Some oxide ions are . State the term that describes the relationship between and .
(iii) The nitride ion and the oxide ion have identical electron configurations. Determine, with a reason, which of the two ions is larger.
(iv) Suggest, giving a reason, whether calcium or nitrogen would have the greater sixth ionization energy.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
(i) protons: 8 AND neutrons: 8 AND electrons: 10 ✔
(ii) isotopes ✔
(iii) nitride AND lower nuclear charge / fewer protons / lower atomic number «so a weaker attraction for the same ten electrons» ✔
(iv) nitrogen AND the sixth electron is removed from the first energy level / 1s sublevel, close to the nucleus «whereas for calcium it is removed from the third energy level / 3p sublevel» ✔
Schemat punktowania
Each of (i)-(iv) scores [1]. (i) all three numbers needed. (iii) accept “nitride has fewer protons attracting the same number of electrons”. (iv) accept nitrogen AND electron removed from a lower energy level than in calcium.