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2C- GASES IN THE ATMOSPHERE (Air as a mixture (Nitrogen (78.1%), Oxygen…
2C- GASES IN THE ATMOSPHERE
Air as a mixture
Nitrogen
78.1%
Oxygen
21.0%
Argon
0.9%
Carbon Dioxide
0.04%
Moisture
0-4%
Iron experiment (metal)
vol of water divided by total vol of air X 100%
Water level rises
Oxygen is removed from the air
Oxide water rises to replace oxygen
Iron + water ---> Hydrated Ion (III) Oxide
4Fe + 3O2 + 2xH2O----> 2Fe2O3 . xH2O
Percentage of Oxygen experiment (Cu metal)
Copper + Oxygen= Copper Oxide
Gases left behind
Nitrogen, Argon, CO2
Mass change
Increased
Oxygen combines with copper and gains mass
Volume of gas decreases
Oxygen reacts with copper and is removed
Oxygen Experiment
Spill relighted
2H2O2 ---> 2H2O(I) + O2
Magnesium Dioxide
It is a CATALYST
Fizzing- no change to the appearance
Upward displacement