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
Electrolysis of aqueous solutions
- 3 things to know
- Chemistry Paper 1
Overview
Which ions are present in a solution, how relative reactivity decides whether the metal or hydrogen forms at the cathode, when oxygen or a halogen forms at the anode, predicting products, and testing the gases collected.
What you need to know
Answer each one before you reveal it.
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Key term
What decides which ions are discharged when a solution is electrolysed with inert electrodes?
Key term
Which ions are present in a solution made by dissolving a single ionic compound in water?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What decides which ions are discharged when a solution is electrolysed with inert electrodes?
Model answer
The relative reactivity of the elements whose ions are present.
- 2
Which ions are present in a solution made by dissolving a single ionic compound in water?
Model answer
The positive and negative ions of the compound, together with hydrogen ions and hydroxide ions from the water.
- 3
Why can electrolysing a solution give different products from electrolysing the same compound molten?
Model answer
In solution the water also supplies ions, so hydrogen or oxygen may be discharged instead of the compound's own ions.
- 4
What is formed at the cathode when the metal in the dissolved compound is more reactive than hydrogen?
Model answer
Hydrogen gas.
- 5
Predict the product at the cathode when copper sulfate solution is electrolysed, and explain why.
Model answer
Copper, because copper is less reactive than hydrogen so its ions are discharged.
- 6
Predict the product at the cathode when sodium chloride solution is electrolysed, and explain why.
Model answer
Hydrogen, because sodium is more reactive than hydrogen so the sodium ions stay in solution.
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