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
Atomic Structure and the Periodic Table
From the plum pudding model to the nuclear model
- 3 things to know
- Chemistry Paper 1
Overview
How new evidence changes scientific models, Thomson's discovery of the electron and the plum pudding model, Rutherford's alpha particle scattering experiment and what its results showed about the nucleus and empty space, Bohr's electron orbits, and the naming of protons.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
Which scientist is credited with discovering the electron?
Key term
Which experiment provided the evidence that led to the nuclear model?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What can cause a scientific model to be changed or replaced?
Model answer
New experimental evidence that the existing model cannot explain.
- 2
Before the electron was discovered, what were atoms thought to be?
Model answer
They were thought to be tiny spheres that could not be divided.
- 3
Which scientist is credited with discovering the electron?
Model answer
J J Thomson.
- 4
Describe the plum pudding model of the atom.
Model answer
It pictures the atom as a ball of positive charge with negative electrons embedded in it.
- 5
In the plum pudding model, where is the positive charge?
Model answer
It is spread throughout the whole atom.
- 6
Which experiment provided the evidence that led to the nuclear model?
Model answer
The alpha particle scattering experiment.
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