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
Bonding, Structure, and the Properties of Matter
Diamond and graphite
- 3 things to know
- Chemistry Paper 1
Overview
Why diamond has a very high melting point, bonding between the layers in graphite and why graphite conducts electricity.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
Why does diamond not conduct electricity?
Key term
Why is diamond very hard?
Questions from this subtopic
Each one with the model answer underneath.
- 1
How many covalent bonds does each carbon atom form in diamond?
Model answer
Four.
- 2
Why does diamond not conduct electricity?
Model answer
All of its outer electrons are used in covalent bonds, so it has no delocalised electrons free to move.
- 3
Why is diamond very hard?
Model answer
Every carbon atom is joined to four others by strong covalent bonds in a rigid giant structure.
- 4
Explain why diamond has a very high melting point.
Model answer
A great deal of energy is needed to overcome the many strong covalent bonds between its carbon atoms.
- 5
Explain, in terms of its structure and bonding, why diamond is used in cutting tools.
Model answer
Its rigid giant covalent structure, with four strong bonds from every atom, makes it extremely hard.
- 6
How many other carbon atoms is each carbon atom bonded to in graphite?
Model answer
Three.
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