1. Gases in the atmosphereLOs: Propose the composition ofEarths atmosphere. Describe processes that lock awaycarbon from the air. Explain how the gases in air canbe separated.

2. Gases in the atmosphere Gas% OxygenCarbon Dioxide NitrogenArgon0 9 . 72 08 4 1 .0 3. Gases in the atmosphere Gas % Oxygen 21Carbon Dioxide 0.04 Nitrogen 78Argon 0.9 1OxygenCarbon Dioxide 2Nitrogen 3Argon4 4. Gases in the atmosphereLOs: Propose the composition ofEarths atmosphere. Describe processes that lock awaycarbon from the air. Explain how the gases in air canbe separated. 5. Sherlock Holmes and theCase of the Disappearing Carbon DioxideGreat ScottHolmes! Where Sedimentary,has all the my dearcarbon dioxideWatson.gone? 6. Carbon SinksCarbon has been locked up in the Earth Limestone / chalk (CaCO3)OceansRainforestsFossil FuelsLiving things 7. FAMILY FORTUNESWe asked 100 people wheres the carbon dioxide gone X1 LimestoneX 382 Oceans 20 X34RainforestsFossil fuels 16 13 X X5All living things 13X 8. Gases in the atmosphereLOs: Propose the composition ofEarths atmosphere. Describe processes that lock awaycarbon from the air. Explain how the gases in air canbe separated. 9. Fractional Distillation (Separating compounds by boiling point into fractions)Separating the gases in air:Make it very cold so liquefiesthen allow to slowly warmCOLDERup and collect one gas.Gas Boiling pointNitrogen-196oCArgon -186oC WARMEROxygen-183oCCarbon Dioxide-78oC 10. What use are the gases?GasUse Make ammoniaNitrogen Inert use in food packaging e.g. crisps Use to cool things e.g. sperm samplesArgonVery inert Use in light bulbsOxygen Hospitals Help breathing WeldingCarbon Dioxide Stage shows dry ice Use to cool things e.g. chemicals 11. Removing two villainsThe Earth may have originally stunkof babies nappies and cow farts.all because of ammonia and methanerespectively.What happened to these? 12. Try summary question2 p.215Use p. 214 to help.Ex. p.218 Q3Extensionp.218 Q3 13. Self-Assessment2.a) fractional distillationb) Removed from liquified air as solids at -200Cc)i) Argonii) Oxygen + Argon have similar b.p. so oftenproduce a mixture. 14. 5%Self-Assessment25% 25%11Nitrogen 2240% Oxygen 33 75%Methane44 30%Ammoniaa) How did the atmosphere of the planet change?Amount of ammonia, methane and oxygen decreased, nitrogen increasedb) What might have caused the change in part a?Oxygen reacted with ammonia and methanec) Copy and complete the word equations to explain the shift oxygenwateri) Methane + .. Carbon dioxide + oxygen waterii) Ammonia + ..Nitrogen + 15. Gases in the atmosphereLOs: Propose the composition ofEarths atmosphere. Describe processes that lock awaycarbon from the air. Explain how the gases in air canbe separated.