a single element or compound that is not mixed with any other substance

a positively charged electrode, in an electrolysis cell, to which the anions are attracted

a negatively charged electrode, in an electrolysis cell, to which the cations are attracted

a liquid or an aqueous salt solution that contains freely moving ions

a process that uses electricity to deposit a thin layer of metal onto the surface of another conductive object

Electrolysis: purifying copper

Combined science

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 is the main purpose of using electrolysis in copper purification?

It decreases as copper ions move into the electrolyte.

It increases as copper ions are deposited.

What happens to the mass of the anode during copper purification by electrolysis?

What is a common application of electrolysis besides purification?

They form a residue in the electrolyte solution. 

What happens to impurities in the anode during copper purification?

To electroplate a bracelet using silver, the anode is...

improved appearance and durability of the surface

Which of the following are benefits of electroplating?

Which electrode is positively charged in an electrolysis cell?

What is the role of the anode in an electrolysis cell?

What happens to negative ions during electrolysis?

What happens to positive ions during electrolysis?

What is produced at the cathode during the electrolysis of copper sulfate solution using copper electrodes?

to ensure effective transfer of metal ions

Why must the electrolyte contain the same ions as the metal being purified?

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