(upper - science) Metal extraction, recycling, rusting

What is the name of the process that uses electricity to separate the elements in a compound?

• reduction
• electrolysis
• extraction
• mining

How would you best extract iron from haematite (iron ore)?

• reduction by carbon
• electrolysis
• decomposition
• oxidation

How could you extract sodium from its ore?

• reduction by carbon

• electrolysis

• decomposition

• oxidation

Which element cannot be extracted from its ore by reduction with carbon?

• iron
• aluminium
• copper
• lead

Iron is extracted from its ore, hematite. Hematite contains silicon dioxide (sand). What reacts with this impurity to remove it?

• Carbon

• Carbon dioxide

• Silicon dioxide

• Calcium oxide

What is the chemical formula of iron(III) oxide?

• FeO

• Fe₂O₃

• Fe2O3

• Fe3O

Which substance is not involved in the extraction of iron from hematite?

• Carbon monoxide

• Carbon

• Nitrogen

• None of the above

Name a metal that could be extracted from its metal oxide by heating with carbon.

• iron
• aluminium
• gold
• magnesium

How would you extract gold?

• Heating with coke

• Electrolysis

• The blast furnace

• Gold is found uncombined

In the blast furnace, limestone is added to...

• Create more heat
• Turn iron oxide into pure iron
• Remove acidic impurities