Extraction

The video tutorial explains how most metals are found in ores combined with elements like oxygen and sulfur. It describes the need for reduction reactions to extract pure metals. Iron is extracted from iron oxide using carbon, while aluminium is extracted through the electrolysis of aluminium oxide.

What are metals commonly found combined with in the earth?

• Nitrogen and hydrogen

• Oxygen and sulfur

• Carbon and nitrogen

• Helium and neon

What is the purpose of a reduction reaction in metal extraction?

• To combine metals with other elements

• To increase the weight of the metal

• To change the color of the metal

• To extract pure metal from its compound

Which element is used to extract iron from iron oxide?

• Hydrogen

• Carbon

• Sulfur

• Oxygen

What process is used to extract aluminium from aluminium oxide?

• Distillation

• Electrolysis

• Heating with carbon

• Filtration

Which of the following metals is extracted using electrolysis?

• Iron

• Copper

• Aluminium

• Gold