Zadanie 3c
Wzorowane na: Chemistry HL Paper 2, May 2026, TZ3, pytanie 3(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 3a-3e.
Metals and their compounds are used in construction, in batteries and as pigments.
Polecenie
Steel is an alloy of iron with a small percentage of carbon.
(i) Outline one reason why steel is harder than pure iron.
(ii) State one property of iron, other than hardness, that can be modified by forming an alloy.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz CKE i punktacja
Odpowiedź z klucza
(i) carbon atoms «of a different size» disturb the regular lattice of iron atoms AND the layers cannot slide over each other easily
OR
atoms of different radii are present AND layers of atoms are prevented from slipping ✔
(ii) Any one of:
resistance to corrosion
melting point
density
electrical conductivity
magnetic behaviour ✔
Schemat punktowania
(i) [1]: both the disruption of the lattice (different sizes) and the effect on sliding layers are needed. (ii) [1]: accept wear resistance or boiling point; ignore malleability, ductility, strength, toughness, lustre or colour.