Zadanie 1f
Wzorowane na: Chemistry HL Paper 2, May 2022, TZ1, 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-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
Atoms were once thought to be the smallest particles of matter, impossible to divide. Suggest two pieces of evidence that show an atom has an internal structure.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
Any two of:
protons, neutrons and electrons «smaller particles than atoms» have been discovered ✔
atoms form ions by gaining or losing electrons ✔
atoms of one element can have different numbers of neutrons / existence of isotopes ✔
scattering experiments show a small dense nucleus surrounded by electrons ✔
emission spectra show electrons in discrete energy levels ✔
atoms can be split «nuclear fission» ✔
Schemat punktowania
[1] for each of two different valid pieces of evidence. Named particles (electron, proton, neutron) are acceptable examples. Do not accept evidence that only concerns molecules or compounds.