The Elements: Aluminium

Aluminium is highly reactive and does not occur naturally in pure form. It is found in compounds like alum and alumina. Initially, aluminium was more valuable than gold due to the difficulty and cost of extraction. New methods have reduced costs, making aluminium widely used in alloys for construction and aerospace. Aluminium is also used in packaging. It can be recycled indefinitely, requiring 95% less energy than new extraction, with 75% of all extracted aluminium still in use today.

Why was pure aluminium once considered more valuable than gold?

• It had unique properties.

• It was difficult and expensive to isolate.

• It was more abundant.

• It was used in jewelry.

What makes aluminium alloys particularly useful in construction and aerospace?

• They are lightweight and strong.

• They are heavy and strong.

• They are cheap and durable.

• They are resistant to corrosion.

Which of the following is a common use of aluminium in packaging?

• Cardboard boxes

• Foils and drink cans

• Glass jars

• Plastic bottles

How much less energy does recycling aluminium require compared to extracting new aluminium?

• 50% less

• 95% less

• 100% less

• 75% less

What percentage of all aluminium ever extracted is still in use today?

• 50%

• 60%

• 70%

• 75%