Oxide

The video explains that both water (H2O) and rust (iron oxide) are oxides. It highlights that a significant portion of the Earth's crust is made up of oxides, with silicon dioxide being the most prevalent, followed by aluminium oxide and other metal oxides.

Which of the following is an example of an oxide?

• Methane

• Ammonia

• Water

• Carbon dioxide

What percentage of the Earth's crust is made up of silicon dioxide?

• 45%

• 30%

• 75%

• 60%

What is the primary component of sand and quartz?

• Calcium carbonate

• Aluminium oxide

• Silicon dioxide

• Iron oxide

Which oxide makes up 15% of the Earth's crust?

• Silicon dioxide

• Iron oxide

• Aluminium oxide

• Magnesium oxide

Apart from silicon and aluminium oxides, what else is the Earth's crust mainly composed of?

• A variety of other metal oxides

• Non-metallic elements

• Pure metals

• Organic compounds