Key term
AQA GCSE Combined Science Chemistry 8464
Atomic Structure and the Periodic Table
Topic overviewAtoms, elements and compoundsWord equations, symbols and balanced equationsMixturesFrom the plum pudding model to the nuclear modelBohr, Chadwick and the modern model of the atomRelative electrical charges of subatomic particlesSize and mass of atomsRelative atomic mass and electronic structureThe periodic tableDevelopment of the periodic tableMetals and non-metalsGroup 0Group 1Group 7
Bonding, Structure, and the Properties of Matter
Topic overviewChemical bonds, including metallic bondingIonic bondingIonic compoundsCovalent bonding and how it is representedThe three states of matter and changes of statePredicting state, state symbols, and the limits of the particle modelProperties of ionic compoundsProperties of small moleculesPolymers and giant covalent structuresProperties of metals and alloys, and why metals conductDiamond and graphiteGraphene and fullerenes
Chemical Analysis
Chemical Changes
Topic overviewThe reactivity seriesMetal oxides, extraction, and redox in terms of electronsAcids reacting with metals, neutralisation and saltsSoluble saltsThe pH scale and neutralisationThe process of electrolysis, and molten ionic compoundsUsing electrolysis to extract metalsElectrolysis of aqueous solutions
Chemistry of the Atmosphere
Topic overviewThe Earth's early atmosphereHow oxygen increased and carbon dioxide decreasedThe gases in today's atmosphere, and which are greenhouse gasesHuman activities which contribute to an increase in greenhouse gases in the atmosphereGlobal climate change and carbon footprintsAtmospheric pollutants from fuels, and their effects
Energy Changes
Organic Chemistry
Quantitative Chemistry
The Rate and Extent of Chemical Change
Chemical Changes
Using electrolysis to extract metals
- 3 things to know
- Chemistry Paper 1
Overview
When electrolysis is used to extract a metal, why the compound must be molten and why the process is costly, and the extraction of aluminium from aluminium oxide mixed with cryolite using carbon anodes that burn away.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
Why must the compound be molten before its metal can be extracted by electrolysis?
Key term
Suggest why metals obtained by electrolysis tend to be expensive.
Questions from this subtopic
Each one with the model answer underneath.
- 1
When is electrolysis used to extract a metal from its compound?
Model answer
When the metal is too reactive to be freed by reduction with carbon, or when it reacts with carbon.
- 2
Why must the compound be molten before its metal can be extracted by electrolysis?
Model answer
The ions have to be free to move so that the compound can conduct the current.
- 3
Name the two things that make electrolysis such an energy-hungry way to extract a metal.
Model answer
Melting the compound and generating the large electric current both take a great deal of energy.
- 4
Suggest why metals obtained by electrolysis tend to be expensive.
Model answer
The huge amount of electrical energy used in the process adds greatly to the cost.
- 5
Name a metal that is too reactive to be extracted by heating its oxide with carbon.
Model answer
Aluminium.
- 6
Which compound is aluminium extracted from?
Model answer
Aluminium oxide.
Other ways to work this
The same content, four other ways.
What is inside Levo
Six ways to work the same material.
Every question in Chemical Changes, on a schedule.
Attempt a question from memory, write the correct version, then attempt it again. Levo records the jump between your first attempt and your last, and brings each question back on the day you are due to forget it.
Or £46 a year, about £3.83 a month. Cancel anytime.