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 neutralisationStrong and weak acidsThe process of electrolysis, and molten ionic compoundsUsing electrolysis to extract metalsElectrolysis of aqueous solutionsRepresentation of reactions at electrodes as half equations
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
Topic overviewMeasuring the mean rate of a reactionRate from graphs, and the gradient of a tangentFactors which affect the rates of chemical reactionsCollision theory and activation energyCatalystsReversible reactions and dynamic equilibriumThe effect of changing conditions on equilibriumThe effect of changing concentrationThe effect of temperature changes on equilibriumThe effect of pressure changes on equilibrium
Chemical Changes
The process of electrolysis, and molten ionic compounds
- 3 things to know
- Chemistry Paper 1
Overview
Electrolytes and why molten or dissolved ionic compounds conduct, electrolysis and the cathode and anode, which ions move to each electrode, what half equations show and what must balance in them, inert electrodes, and predicting the products of electrolysing molten lead bromide, sodium chloride and zinc bromide.
What you need to know
Answer each one before you reveal it.
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Key term
Give two ways of turning a solid ionic compound into an electrolyte.
Key term
What is electrolysis?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is an electrolyte?
Model answer
An ionic compound that has been melted or dissolved in water so that it conducts electricity.
- 2
Why can a molten ionic compound conduct electricity?
Model answer
Melting frees the ions to move about within the liquid.
- 3
Why does an ionic compound not conduct electricity while it is solid?
Model answer
Its ions are held in fixed positions in the lattice, so they cannot move.
- 4
Give two ways of turning a solid ionic compound into an electrolyte.
Model answer
Melt it, or dissolve it in water.
- 5
What is electrolysis?
Model answer
Passing an electric current through an electrolyte so that ions are discharged at the electrodes, producing elements.
- 6
What name is given to the negative electrode?
Model answer
The cathode.
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