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Flashcards in Chemistry of the atmosphere Deck (18):

What is the first phase of the evolution of the atmosphere and what does it involve?

Volcanoes giving out gas: they released CO2, nitrogen, water vapour, methane and ammonia, with no oxygen


What is the second phase of the evolution of the atmosphere and what does it involve?

Oceans algae and green plants absorb CO2: water vapour condenses to form oceans, green plants and algae evolve and photosynthesise


What is the third phase of the evolution of the atmosphere and what does it involve?

Green plants and algae produce oxygen: start to photosynthesise, building up oxygen levels until complex life could evolve


What is the current composition of the atmosphere?

80% nitrogen, 20% oxygen and small amounts of carbon dioxide, noble gases and water vapour


What is a greenhouse gas?

A gas which acts like an insulating layer in the earth's atmosphere


What is the greenhouse effect?

Greenhouse gases cannot absorb short wavelength radiation from the sun but can absorb long, which means that from the earth, which they then re-radiate towards the earth, adding thermal radiation


Which forms of human activity affect greenhouse gas composition in the atmosphere?

Deforestation, burning fossil fuels, agriculture and creating waste


What are the consequences of climate change?

Flooding from ice caps melting, changes in rainfall patterns, increase in severity of storms and wildlife distribution due to changes in climate and water availability


Why are carbon footprints hard to measure?

There are too many different factors to consider so only a rough calculation can be made


How can a carbon footprint be reduced?

Renewable or nuclear energy sources used instead of fossil fuels, use of more efficient processes to cut waste, taxes on emissions, caps on emissions and technology that captures CO2


Why is reducing carbon footprints hard?

Governments do not want to impact on economic growth, individuals do not want to sacrifice lifestyle comforts and technology to help has not been perfected


How is air pollution commonly produced produced?

Through complete combustion; when fossil fuels are oxidised(through combustion), CO2 and water vapour are released into the air


What is incomplete combustion?

There is not enough O2, so not all of fuel burns, which means that unburnt fuel, carbon monoxide and particulates of soot are released into the atmosphere


Why are particulates dangerous?

If inhaled, they can become stuck in the lungs and cause damage. They also cause global dimming, where they reflect sunlight back into space


Why is carbon monoxide dangerous?

Binds to haemoglobin in blood which stops blood from carrying oxygen, which can lead to fainting, coma and death. It is especially dangerous as it is hard to detect


Why can burning fuels with sulfur impurities be bad?

It releases sulfur dioxide, which when mixed with the clouds, causes acid rain


How is nitrogen dioxide produced?

The nitrogen and oxygen in the air react, cause by the heat of the burning to form nitrogen dioxide


What are the negative effects of acid rain?

Plants die, buildings are damages, metal corrodes and causes respiratory problems when breathed in