AQA 8462
Chemistry
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Everything you need to know for Chemistry
Atomic Structure and Periodic Table
Paper 1 • Both
Key Facts
- Period number = number of electron shells.
- Group 0 elements are noble gases and are unreactive.
Subtopics
Atoms and IsotopesElectron Configuration
Bonding, Structure, and Properties
Paper 1 • Both
Key Facts
- Graphite conducts because of delocalised electrons.
- Diamond is hard due to a giant covalent lattice.
Subtopics
Ionic BondingCovalent BondingMetallic Bonding
Quantitative Chemistry
Paper 1 • Both
Key Facts
- Percentage yield is less than 100 percent due to losses.
- Atom economy measures how much product is useful.
Subtopics
Moles and Formula MassSolutions
Chemical Changes
Paper 1 • Both
Key Facts
- Oxidation is loss of electrons; reduction is gain.
- Hydrogen is produced when electrolysis competes with metal ions.
Subtopics
Reactivity SeriesAcids, Bases, and SaltsElectrolysis
Energy Changes
Paper 1 • Both
Key Facts
- Reaction profiles show energy change and activation energy.
- Catalysts lower activation energy.
Subtopics
Exothermic vs EndothermicBond Energies
Rates of Reaction and Equilibrium
Paper 2 • Both
Key Facts
- Increasing temperature increases rate but can reduce yield in exothermic systems.
- Catalysts speed up both forward and reverse reactions.
Subtopics
Rates of ReactionEquilibrium
Organic Chemistry
Paper 2 • Both
Key Facts
- Complete combustion produces CO2 and water.
- Crude oil is separated by fractional distillation.
Subtopics
Alkanes and AlkenesPolymersAlcohols and Carboxylic Acids
Chemical Analysis
Paper 2 • Both
Key Facts
- Flame tests: Na yellow, K lilac, Cu green.
- Pure substances have fixed melting and boiling points.
Subtopics
Gas TestsIon TestsChromatography
Chemistry of the Atmosphere
Paper 2 • Both
Key Facts
- Carbon monoxide is toxic because it binds to hemoglobin.
- NOx contributes to acid rain and photochemical smog.
Subtopics
Earth AtmosphereGreenhouse Gases
Using Resources
Paper 2 • Both
Key Facts
- Alloys improve properties of metals.
- Finite resources require sustainable use.
Subtopics
Potable WaterLife Cycle Assessments