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
Organic Chemistry
Amino acids, DNA and naturally occurring polymers
- 3 things to know
- Paper 2
Overview
What DNA stands for and the genetic instructions it encodes in organisms and viruses, its two polymer chains in a double helix built from four different nucleotides, and proteins, starch and cellulose as naturally occurring polymers built from amino acids and glucose.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
How many polymer chains are there in most DNA molecules, and what shape do they take?
Key term
Name three naturally occurring polymers other than DNA that are important for life.
Questions from this subtopic
Each one with the model answer underneath.
- 1
What does the abbreviation DNA stand for?
Model answer
Deoxyribonucleic acid.
- 2
What does DNA do in a living organism?
Model answer
It encodes the genetic instructions for the development and functioning of that organism.
- 3
Apart from living organisms, what else relies on DNA to carry genetic instructions?
Model answer
Viruses.
- 4
How many polymer chains are there in most DNA molecules, and what shape do they take?
Model answer
Two chains, twisted around each other in a double helix.
- 5
What are the monomers of DNA called, and how many different ones are there?
Model answer
They are called nucleotides, and there are four different ones.
- 6
Name three naturally occurring polymers other than DNA that are important for life.
Model answer
Proteins, starch and cellulose.
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