The Uses of Metals: Physical and Chemical Properties

The video discusses how the uses of metals are linked to their physical and chemical properties. It covers general properties of metals like conductivity, malleability, and density, and highlights exceptions such as brittle iron and liquid mercury. The video focuses on aluminium, noting its low density, strength, and corrosion resistance, making it ideal for aircraft and food containers. Copper's conductivity and ductility are discussed, with a comparison to aluminium for overhead cables. The presentation concludes with a summary of metal uses.

Which of the following is a general property of metals?

• They are poor conductors of electricity.

• They are mostly brittle.

• They have high melting points.

• They are less dense than water.

Why is aluminium often used in aircraft manufacturing?

• It is cheaper than other metals.

• It is less dense, reducing energy needed for flight.

• It is more reactive than other metals.

• It is more conductive than copper.

What makes aluminium suitable for food containers?

• It is a poor conductor of heat.

• It is heavier than most metals.

• It forms a protective oxide layer.

• It reacts easily with acids and salts.

Why is copper not used for overhead electrical cables?

• Copper is not a good conductor of electricity.

• Copper is too flexible for cable use.

• Copper is denser and would make cables heavier.

• Copper is more expensive than aluminium.

Which property of copper makes it ideal for electrical wiring?

• It is highly malleable.

• It is a good conductor and ductile.

• It is resistant to corrosion.

• It has a low melting point.