How has the concentration of different gases in the atmosphere changed over time?
Carbon dioxide levels significantly decreased -> due to formation of plants and algae using them for photosynthesis. Also this CO2 is locked up in fossil fuels and dissolved in oceans.
Ammonia converted into nitrogen in todays early atmosphere and water vapour condensed, forming oceans. Methane ??
How has the concentration of different gases in the atmosphere changed over time?
Lots of CO2 early on as they were released from volcanoes. Then less CO2 as they dissolved in seas/oceans and plants/algae used them for photosynthesis. Even less nowadays, the air consists now of around 21% Oxygen and 78% Nitrogen.
Using only the revision guide is a bad idea The REVISION GUIDE WAS MADE IN 2011!!! The Specification was made in 2014!!! - new topics have arose since then and old ones removed - the exam board make the specification whereas the CGP guide was made by a 'Independent company' *see what i did there with the pun xD
Yeah, I know but if that's the one that your school tells you to revise from, what can you do? Yeah, that pun was pretty good
Cracking is the process of breaking large/long chain molecules of ALKANES into shorter chain ALKANE and an ALKENE. This is done at a high temperature and presence of catalyst.
Cracking is the process of breaking large/long chain molecules of ALKANES into shorter chain ALKANE and an ALKENE. This is done at a high temperature and presence of catalyst.
Nice, vaporised and passed over a catalyst of aluminium oxide, done at a high temp.