a type of reaction in which a substance gains electrons or loses oxygen

a type of reaction in which a substance loses electrons or gains oxygen

a chemical equation used to show the electrons lost in oxidation or the electrons gained in reduction

a balanced equation showing all the ions involved in a reaction

the ions not involved in a chemical reaction

Half equations: electrolysis

Combined science

Principles of electrolysis

Electrolysis of molten salts

Electrolysis: extracting aluminium

Electrolysis of aqueous solutions

Electrolysis: brine

Electrolysis: purifying copper

Electrolysis: aqueous solutions practical

In the Using Earth's Resources unit, pupils learned about the extraction, production and uses of hydrocarbons from crude oil, as well as metal extraction.

This unit focuses on electrolysis, electrode reactions, and predicting products, including competing reactions in solutions. It explains metal extraction through electrolysis and writing ionic equations. It also covers tests for gases like oxygen, hydrogen, carbon dioxide, and chlorine.

Electrolysis

What happens to all reactants in a reaction.

What happens to one reactant in a reaction.

What happens to the products in a reaction.

When an atom gains electrons we say it has been ...

At the cathode, because positive ions gain electrons.

At the anode, because negative ions lose electrons.

At the cathode, because negative ions lose electrons.

At the anode, because positive ions gain electrons.

In an electrolysis cell, where does oxidation occur? why?

Ions that are formed as a result of the reaction.

Ions that do not take part in the reaction.

In the electrolysis of molten zinc chloride, the ionic equation is Zn²⁺(l) + 2Cl⁻(l) → Zn(s) + Cl₂(g). Which of the following is correct?

A process where substances are mixed but not changed.

A process where substances change into new substances.

A process where substances retain their original properties.

Substances that are formed as the result of a chemical reaction.

Substances that do not change during a reaction.

Substances that take part in and undergo change during a reaction.

Substances that are mixed but not changed.

A representation of a chemical reaction using numbers.

A representation of a chemical reaction using symbols.

A representation of a chemical reaction using names of the chemicals involved.

Mass is always decreased in a chemical reaction.

Mass is always increased in a chemical reaction.

Mass is neither created nor destroyed in a chemical reaction.

A number representing the mass of an element.

A one- or two-letter representation of an element.

Half equations: electrolysis

Lesson outcome