Alloys Questionbank

linear, temperature

symmetrical, regularity

asymmetrical, mass

bent, conductivity

Alloys are insulators because they lack delocalised electrons

Alloys only conduct electricity when they are in the molten state

Alloys conduct electricity better because they contain more types of atoms

Alloys still conduct electricity but generally have lower conductivity than pure metals

$M_{\text{avg}} = \frac{50.0 + 100.0}{2}$

$M_{\text{avg}} = 0.50 \times (60 + 40)$

$M_{\text{avg}} = (0.60 \times 50.0) + (0.40 \times 100.0)$

$M_{\text{avg}} = (60 \times 50.0) + (40 \times 100.0)$

True

False

valence bands

electron shells

interstices

substitutional sites

By increasing the total number of delocalised electrons

By forming ionic bonds with the iron cations

By filling the gaps between iron atoms and hindering the sliding of layers

By reacting with iron to form a soft, protective coating

Chromium oxide is a liquid that coats the surface

Chromium oxide is porous and allows the metal to breathe

Chromium oxide is adherent and creates a non-porous barrier

Chromium oxide reacts with iron to form a new metal

The metal cations are all of identical size, which allows layers to slide past each other when a force is applied.

The metal cations are of different sizes, which prevents the layers from sliding past each other.

The metallic bonds are directional, allowing the cations to shift into new fixed positions easily.

The delocalized electrons are held in fixed positions, acting as a lubricant between the layers.

Atoms of a similar size to the host metal replace some of the original atoms in the lattice.

The added atoms react chemically to form covalent bonds with the host metal.

Non-metal atoms dissolve into the sea of delocalised electrons without affecting the lattice.

Smaller atoms fit into the small spaces or interstices between the host metal atoms.

It is much softer and easier to bend into complex shapes

It contains no metal ions and is therefore non-magnetic

It forms a protective oxide layer that resists corrosion from bodily fluids

It is a perfect electrical insulator