The video tutorial explains the process of metal corrosion, using iron rusting as an example, which requires both water and oxygen. It highlights that more reactive metals corrode faster, with aluminium being an exception due to its protective oxide layer that prevents further corrosion.

What two elements are necessary for the rusting of iron to occur?

• Water and nitrogen

• Nitrogen and carbon dioxide

• Water and oxygen

• Oxygen and carbon dioxide

How does the reactivity of a metal generally affect its corrosion rate?

• Less reactive metals corrode more quickly

• More reactive metals corrode more quickly

• Reactivity does not affect corrosion rate

• More reactive metals corrode more slowly

Which metal forms a protective oxide layer that prevents further corrosion?

• Aluminium

• Copper

• Zinc

• Iron

What is the role of aluminium's oxide layer in corrosion?

• It has no effect on corrosion

• It accelerates corrosion

• It makes aluminium more reactive

• It prevents further corrosion

Which of the following metals is an exception to the general rule of corrosion due to its protective oxide layer?

• Iron

• Aluminium

• Lead

• Copper