Alloys IGCSE Video Quiz

What is an alloy?

• A compound formed between a metal and a non-metal with fixed proportions.

• A mixture of two or more metals, or a metal and a non-metal, retaining metallic properties.

• A pure metal that has been hardened through a special process.

• A substance where electrons are localized in fixed bonds.

What property allows pure metals to be ductile?

• The fixed proportions of elements in their structure.

• The strong directional bonds between atoms.

• The ability of atoms to slide past each other due to non-localized electrons.

• The presence of a high percentage of non-metallic elements.

Which alloy is primarily composed of copper and tin, and was historically significant in early human communities?

• Brass

• Carbon Steel

• Bronze

• Stainless Steel

Why are alloys generally harder than pure metals?

• Alloys have a higher melting point, making them more resistant to deformation.

• The different sizes of atoms in an alloy disrupt the regular arrangement, blocking the movement of dislocations.

• Alloys have more free electrons, which increases the strength of the metallic bonds.

• The atoms in alloys form covalent bonds, which are stronger than metallic bonds.