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
Chemistry of the Atmosphere
The gases in today's atmosphere, and which are greenhouse gases
- 3 things to know
- Chemistry Paper 2
Overview
The composition of the atmosphere over the last 200 million years, about 80% nitrogen and 20% oxygen with small proportions of carbon dioxide, water vapour and noble gases, the greenhouse gases and why they matter for life, and how the greenhouse effect traps long wavelength radiation.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Numbers
A sample of air has a volume of 500 cm³. Calculate the approximate volume of oxygen it contains.
Key term
Name three greenhouse gases.
Questions from this subtopic
Each one with the model answer underneath.
- 1
For roughly how long have the proportions of the gases in the atmosphere been much the same as they are today?
Model answer
For about 200 million years.
- 2
Has the composition of the atmosphere changed much in the last 200 million years?
Model answer
No, the proportions of the gases have stayed much the same throughout that time.
- 3
Which gas makes up about four-fifths of the atmosphere?
Model answer
Nitrogen.
- 4
What is the approximate percentage of nitrogen in the atmosphere?
Model answer
About 80%.
- 5
Which gas makes up about one-fifth of the atmosphere?
Model answer
Oxygen.
- 6
What is the approximate percentage of oxygen in the atmosphere?
Model answer
About 20%.
Other ways to work this
The same content, four other ways.
What is inside Levo
Six ways to work the same material.
Every question in Chemistry of the Atmosphere, on a schedule.
Attempt a question from memory, write the correct version, then attempt it again. Levo records the jump between your first attempt and your last, and brings each question back on the day you are due to forget it.
Or £46 a year, about £3.83 a month. Cancel anytime.