The Elements: Carbon

Carbon is a versatile element forming millions of compounds, including those essential for life. It exists in various forms called allotropes, each with unique properties. Diamond is hard and used in tools, while graphite is soft and used in pencils. Amorphous carbon is found in coal and charcoal. In 2004, graphene, a one-atom-thick carbon form, was discovered, offering potential in many fields. Carbon's diverse forms and applications make it a fascinating element.

What is the term used to describe different forms of pure carbon found in Earth's crust?

• Mixtures

• Isotopes

• Allotropes

• Compounds

Which carbon allotrope is known for being one of the hardest substances on Earth?

• Graphene

• Diamond

• Amorphous carbon

• Graphite

What is a common use for graphite due to its soft and slippery nature?

• Construction material

• Jewelry

• Fuel

• Pencil lead

Which form of carbon is found in substances like coal and charcoal?

• Amorphous carbon

• Diamond

• Graphene

• Graphite

What is a notable property of graphene that makes it unique?

• It is the heaviest material

• It is the most brittle material

• It is the most expensive material

• It is the strongest and thinnest material