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
Chemical Changes
Titrations
- 3 things to know
- Paper 1
Overview
What a titration measures and why an indicator is needed, the pipette and burette, the three acids used, adding acid drop by drop near the end point, concordant titres, the white tile and rinsing, working out the titre from burette readings, and why the first titration is a rough one.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
Name an indicator suitable for a titration between an acid and an alkali.
Key term
Why is one titration on its own not good enough?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What does a titration measure?
Model answer
The volumes of an acid solution and an alkali solution that exactly react with each other.
- 2
Why is an indicator needed in a titration?
Model answer
It changes colour to show the moment when the acid and alkali have exactly reacted.
- 3
Name an indicator suitable for a titration between an acid and an alkali.
Model answer
Phenolphthalein, or methyl orange.
- 4
Why is one titration on its own not good enough?
Model answer
Repeats are needed so that closely agreeing results can be averaged, which makes the value more reliable.
- 5
Which piece of apparatus measures the fixed volume of alkali placed in the conical flask?
Model answer
A pipette used with a pipette filler.
- 6
Which piece of apparatus holds the acid and lets it be added a little at a time?
Model answer
A burette.
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