Key term
AQA GCSE Chemistry 8462
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 7Transition metals, and how they differ from Group 1
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 fullerenesSizes of particles and their propertiesUses of nanoparticles
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 neutralisationTitrationsThe 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
Topic overviewCrude oil, hydrocarbons and alkanesFractional distillation and petrochemicalsProperties of hydrocarbonsCracking, and testing alkenes with bromine waterWhy cracking is useful, and equations for itStructure and formulae of alkenesReactions of alkenesAlcoholsCarboxylic acidsAddition polymerisationAmino acids, DNA and naturally occurring polymers
Quantitative Chemistry
The Rate and Extent of Chemical Change
Using Resources
Topic overviewUsing the Earth's resources and sustainable developmentProducing potable water in the UKDesalination, and analysing water samplesWaste water treatmentLife cycle assessmentWays of reducing the use of resourcesCorrosion and its preventionAlloys as useful materialsGlass, clay ceramics and polymersComposites, and comparing materialsThe Haber processProduction and uses of NPK fertilisers
Energy Changes
Cells and batteries
- 3 things to know
- Paper 1
Overview
How chemical reactions in a cell produce a current, how the electrodes and electrolyte set its voltage, making a simple cell, batteries as cells in series, why non-rechargeable cells stop working, recharging with an external current, comparing the two types, and linking voltage to differences in metal reactivity.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
Explain how a cell is able to produce an electric current.
Key term
Name two factors that the voltage produced by a cell depends on.
Questions from this subtopic
Each one with the model answer underneath.
- 1
What do cells contain that allows them to produce electricity?
Model answer
Chemicals that react together.
- 2
Explain how a cell is able to produce an electric current.
Model answer
Chemical reactions between the substances inside the cell transfer energy, which drives a current around the circuit it is connected to.
- 3
Name two factors that the voltage produced by a cell depends on.
Model answer
The type of electrode and the electrolyte used.
- 4
Two cells use the same electrolyte but different pairs of metals as electrodes. Suggest why their voltages are different.
Model answer
The voltage depends on which metals are used as the electrodes, so a different pair gives a different voltage.
- 5
Describe how to make a simple cell.
Model answer
Connect two different metals and place them in contact with an electrolyte.
- 6
Why must the two electrodes in a simple cell be made from different metals?
Model answer
Two identical metals have the same reactivity, so no voltage would be produced.
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