Oxidation Reactions

The video explains how metals react with oxygen, focusing on oxidation and corrosion. Aluminium forms a protective oxide layer that prevents further reaction, while iron rusts when exposed to water and oxygen, forming hydrated iron oxide. The video highlights both destructive and beneficial aspects of oxidation.

What happens to aluminium when it is heated in air?

• It melts without any reaction.

• It forms a protective layer.

• It turns into a liquid.

• It explodes and forms aluminium oxide.

Which of the following is a common example of corrosion?

• Evaporation of water

• Melting of ice

• Rusting of iron

• Burning of wood

What conditions are necessary for iron to rust?

• Presence of salt

• High temperatures

• Contact with water and oxygen

• Exposure to sunlight

How does aluminium oxide protect the metal beneath it?

• By reflecting sunlight

• By forming a thick, impenetrable layer

• By quickly reforming if scratched

• By absorbing moisture

Why is aluminium foil useful for wrapping foods?

• It adds flavor to the food.

• It is cheaper than other materials.

• It prevents oxygen and water from reaching the food.

• It is lightweight and easy to shape.