Half-equations - Higher tier

A half-equation shows you what happens at one of the electrodes during electrolysis. You should be able to complete and balance half-equations for the reactions that happen during electrolysis. Writing a half-equation Electrons are shown as e- in half-equations. A half-equation is balanced...

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Aluminium extraction

Aluminium is the most abundant (found in large quantities) metal on Earth. But it is expensive, largely because of the amount of electricity used up in theextraction process. Aluminium ore is called bauxite. The bauxite is purified to...

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Atoms

Atoms consist of electrons surrounding a nucleus that contains protons and neutrons. Neutrons are neutral, but protons and electrons are electrically charged: protons have a relative charge of +1 and electrons have a relative charge of -1. Atoms and elements All...

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