GCSE Chemistry OCR C1 Air Quality

annaryann's version from 2015-07-20 12:59


Question Answer
What is the % of carbon dioxide in the current atmosphere?0.04%
What is the % of nitrogen in the current atmosphere?78%
What is the % of argon in the current atmosphere?1%
What is the % of oxygen in the current atmosphere?21%
What are clouds?They are water or ice, so they are not parts of the air
Why is there a lot of space between gas particles in gases?Because particles are very small, so they can be squeezed into a smaller volume, like in a bike tyre
How much % of water vapour is in the current atmosphere?It changes due to different levels of humidity (the weather)
What do volcanoes release?Huge amounts of carbon dioxide and water vapour
How was carbon dioxide in the early atmosphere different to it is now?It was more abundant
What changed the levels of carbon dioxide in the early atmosphere, making them lower?Photosynthesis occurred, making carbon dioxide lower and oxygen more abundant, and being locked in sedimentary rock
How was water vapour gradually removed from the earth's early atmosphere?It got condensed into the oceans when the Earth cooled, photosynthesis
What are 3 examples of pollutants that are harmful to health?carbon monoxide, sulpher dioxide and nitrogen oxides
Why is carbon monoxide harmful?Because it reduces the amount of oxygen that blood can carry
How is carbon dioxide linked to climate change?It acts as a greenhouse gas by trapping heat in the atmosphere
What pollutants make acid rain?Sulpher dioxide and nitrogen dioxide
How do humans affect air quality?Burning down forests (increases carbon dioxide), burning fuels (factories, power stations, transport)
What are hydrocarbons?They contain only carbon and hydrogen atoms - such as fossil fuels like petrol, diesel and fuel oil
What is the equation for when a hydrocarbon fuel burns?Hydrocarbon fuel + oxygen --> Carbon dioxide + water (+ energy)
What is the difference between oxidation and reduction?Oxidation is when oxygen is added to something, reduction is when it is removed from a substance
What is the equation for when sulpher burns?Sulpher + oxygen --> Sulpher dioxide
What happens if not enough air is available to burn the carbon-based fuel?Poisonous carbon monoxide is made, and bits of solid carbon (particulates) are made
How do car engines contribute to acid rain?They make nitrogen oxides, this contributes to acid rain
What happens when nitrogen monoxide is released into the atmosphere?It cools then reacts with more oxygen to form toxic nitrogen dioxide
How is carbon dioxide removed from the air (current atmosphere)?When it is used by plants for photosynthesis and when it is dissolved in rain water and oceans
How are sulpher and nitrogen oxides removed from the air (current atmosphere)?They react with water and oxygen to form acid rain
How do power stations remove solid particulates from gases?Electrostatic filters
How can we reduce our use of fossil fuels?Using alternative energy sources, improving building insulation, walking, cycling or using public transport
What does carbon neutral mean?When biofuels are burnt, they release the same amount of carbon dioxide that the plant originally took from the air to grow
What is the reaction involving a (platinum) catalytic converter that happens in engines?Carbon monoxide + nitrogen monoxide --> Nitrogen + carbon dioxide

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