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Gases - Coggle Diagram
Gases
Gases in atmosphere
N 78%
O2 21%
Argon 0.9%
CO2 0.4%
Properties of CO2
Very soluble in water
Fizzy drinks
Greenhouse gas
Contributes to enhanced greenhouse gas effect --> global warming
Higher density
Fire extinguishers and dry ice
Experiments
Finding % oxygen in air
Heat copper in 100cm3 of air
Forms CuO - black solid
removes O2 in air sample
All air reacted
%O2 = (initial vol.-final vol.)/ initial vol. x100%
Decomposition of H2O2 using catalyst (manganese oxide)
Prep of CO2
React carbonate with an acid
Decomposition of carbonate
Thermal decomposition (carbonate is heated)
Rate of decomposition varies
Measure time taken to turn 5cm3 limewater cloudy
Pollutants
SO2
produced by burning fuels containing sulphur impurities
SO2 dissolves in water vapour in atmosphere
acid rain
changes pH level of small lakes and ponds
danger to aquatic life
SO2 is toxic
breathing difficulties
NOx (gaseous nitrates)
produced in car engines
hot temperatures means N2 and O2 in atmosphere react
Gas/smog is toxic
breathing difficulties
Metal oxides vs non-metal oxides
Metal oxides
form solids
white
form alkaline solutions
Non-metal oxides
form gases
often toxic
form acidic solutions
