Explain why alloys such as brass, bronze and stainless steel are mixtures rather than compounds, and account for their greater hardness and strength compared with pure metals through non-directional metallic bonding and disrupted layers of atoms.
Tę umiejętność sprawdza 6 zadań wzorowanych na arkuszach IB z lat 2022–2026.
An alloy of magnesium and aluminium is used for car wheels and laptop casings. (i) Suggest why adding aluminium produces a material that is harder and less malleable than magnesium alone. (ii) Suggest why a magnesium alloy is a good choice for the casing of a…
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.
Bronze, an alloy of copper and tin, is used for ship propellers and bearings. Explain, by referring to its structure, why bronze is less malleable than pure copper.
Which statements about alloys are correct? I. Alloys can contain non-metallic elements as well as metals. II. Alloys are usually softer than the pure metals they contain, because their layers slide over each other more easily. III. Atoms of different sizes…
Brass is an alloy of copper and zinc. Explain why brass is harder and stronger, but a poorer conductor of electricity, than pure copper.
A pure metal is mixed with a small amount of a second metal whose atoms have a different radius. The regular arrangement of atoms is distorted, so the layers can no longer glide past one another easily. Which property of the metal will increase as a result? A.…
Zapisujemy na Twoim urządzeniu to, bez czego serwis nie działa, np. zalogowanie. Plików analitycznych użyjemy tylko za Twoją zgodą. Szczegóły w polityce prywatności.