Please enable JavaScript.
Coggle requires JavaScript to display documents.
gases in the atmosphere - Coggle Diagram
gases in the atmosphere
percentages of gases in the air
78% nitrogen
21% oxygen
0.96% argon
0.04% carbon dioxide
experiment example with copper
100 cm3 of air passed from side to side over copper that was being heated with a bunsen burner
All oxygen in air will react with copper
It’s a closed system – therefore, no air could get in or out
As it is passed, the volume of air will decrease
Continued until the volume stops decreasing, then record the volume of remaining air
There would be about 79cm3 left, showing that 21cm3 of the original 100cm3 of air was oxygen
combustion
combustion is an example of oxidation
In an oxidation reaction, a substance gains oxygen
Metals and non-metals can take part in these reactions
thermal decomposition
Metal carbonate –(heat)-> metal oxide + carbon dioxide
climate change
Greenhouse gas effect maintains temperatures on Earth high enough to support life
Greenhouse gases include: water vapour, CO2 & CH4
Explanation of the greenhouse gas effect:
Electromagnetic radiation at most wavelengths from the sun passes through the Earth’s atmosphere
The Earth absorbs some radiation and thus warms up (essential for life on Earth). But some heat is radiated from the Earth as infrared radiation.
Some of this IR radiation is absorbed by greenhouse gases in the atmosphere
Atmosphere warms up leading to the greenhouse effect and global warming
global warming is an 'enhanced greenhouse effect'
an increase in average global temperature is a major cause of climate change