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 neutralisationThe 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
Quantitative Chemistry
The Rate and Extent of Chemical Change
Chemistry of the Atmosphere
Human activities which contribute to an increase in greenhouse gases in the atmosphere
- 3 things to know
- Chemistry Paper 2
Overview
Human activities that increase carbon dioxide and methane, including burning fossil fuels, deforestation, cattle farming, rice growing and landfill, the peer-reviewed conclusion that they cause climate change, why peer review matters, uncertainty in simplified climate models, judging and communicating evidence, and why ethical questions about climate action divide people who accept the same evidence.
What you need to know
Answer each one before you reveal it.
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Key term
What effect have human activities had on the amounts of greenhouse gases in the atmosphere?
Key term
Which two greenhouse gases are increased by human activity?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What effect have human activities had on the amounts of greenhouse gases in the atmosphere?
Model answer
Some human activities have increased them.
- 2
Which two greenhouse gases are increased by human activity?
Model answer
Carbon dioxide and methane.
- 3
Which greenhouse gas is added to the atmosphere mainly by burning fuels?
Model answer
Carbon dioxide.
- 4
Give two human activities that increase the amount of carbon dioxide in the atmosphere.
Model answer
Burning fossil fuels and cutting down forests.
- 5
Explain how deforestation increases the amount of carbon dioxide in the atmosphere.
Model answer
Fewer trees remove less carbon dioxide by photosynthesis, and burning or decay of the felled wood releases more carbon dioxide.
- 6
Give two human activities that increase the amount of methane in the atmosphere.
Model answer
Farming cattle and growing rice in flooded fields.
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