C1 0.0 / 5 ? ChemistryAir QualityGCSEAQA Created by: Hattie BarnettCreated on: 03-05-17 18:17 Where did CO2 come from in the early atmosphere? Volcanoes 1 of 27 What happened to water vapour in the early atmosphere? When earth cooled it condensed into oceans 2 of 27 What happened to the CO2 in the early atmosphere? It dissolved into oceans and was used in photosynthesis by plants 3 of 27 How much nitrogen is in the atmosphere today? 78% 4 of 27 How much CO2 is present in the atmopshere today? Traces 5 of 27 How is human actvity changing the composition of the atomsphere? Combustion is increasing the CO2 levels 6 of 27 What do you call atoms that are joined together? A molecule 7 of 27 Can atoms disappear in chemical reactions? No, the mass of reactants must be the same as the mass of the products 8 of 27 What is a hydrocarbon? Carbon and hydrogen compounds 9 of 27 Is coal a pure hydrocarbon? No, it contains other impurities, not just carbon and hydrogen 10 of 27 What type of chemical reaction is combustion? Oxidation 11 of 27 What is oxidation? Where an oxygen atom is added so it reacts 12 of 27 Complete the symbol equation for burning coal: C + O2 -> CO2 13 of 27 What is incomplete combustion? Where there is not enough oxygen available when fuels are burnt 14 of 27 Why is carbon monoxide an example of incomplete combustion? There is not enough oxygen available for the burning carbon to form carbon dioxide (2oxygen atoms) only carbon monoxide (1 carbon atom) 15 of 27 Name one harmful affect of carbon dioxide Global warming 16 of 27 Why is carbon monoxide harmful? It is poisonous, causing headaches and drowsiness, even death 17 of 27 What are particulates? Tiny carbon particles left in air after incomplete combustion 18 of 27 What is the problem with sulfur dioxide? It reacts with moisture in clouds forming sulfuric acid, causing acid rain. Acid rain can kill plants and damage buildings 19 of 27 Where does sulfur pollution come from? Impurities in fuels 20 of 27 How can sulfur pollution be reduced? React the captured sulfur dioxide with an alkali eg. Sea water or an alkaline slurry 21 of 27 How does nitrogen pollution occur? High temperatures in combustion result in nitrogen in the air reacting with oxygen forming nitrogen dioxide or monoxide 22 of 27 How many oxygen atoms does nitrogen monoxide have? 1 23 of 27 What problems do nitrogen pollutants cause? Acid rain (dilute nitric acid) 24 of 27 What is a catalyst converter? Converts harmful nitrogen monoxide into nitrogen and oxygen by reduction (nitrogen loses an oxygen atom) 25 of 27 What else can a catalytic converter do? Converts toxic carbon monoxide into less harmful carbon dioxide by adding oxygen (oxidation) 26 of 27 Name 3 other ways to reduce pollution... Electric cars, public transport, biofuel cars, MOTs to check pollution levels 27 of 27
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