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    (Original post by 4dam)
    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 ??
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    (Original post by 4dam)
    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.
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    (Original post by kefalos23)
    Easy one : What is the atomic and mass number of an element?
    atomic number = number of protons
    mass number - the mass of the neutron basically so no. of protons + no. of neutrons
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    (Original post by GeorgeMillerr)
    A drunk rat?
    Omg 😂 Who knows it might come up tomorrow knowing aqa
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    (Original post by GeorgeMillerr)
    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
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    (Original post by GeorgeMillerr)
    Well I will guarantee there wont be anything about metal stress, this will resume tomorrow when my point is proven
    You're Probs right mate, I'm just sticking with the crap I know
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    (Original post by 4dam)
    How has the concentration of different gases in the atmosphere changed over time?
    Then : carbon dioxide, ammonia, methane and water vapour
    Now : oxygen 21% nitrogen 78% 1 % of other gasses
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    (Original post by kefalos23)
    Easy one : What is the atomic and mass number of an element?
    Atomic number - Number of protons
    Mass number - Number of protons plus neutrons
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    Can someone link me the spec?
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    Apparently the 6 marker is on quarrying advs + disadvs
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    What happened to Ammonia,Methane and argon in early atmosphere - to todays atmosphere.
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    What is cracking and how does it work?
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    Name:  image.jpeg
Views: 86
Size:  120.0 KBSorry guys, just a moral booster.
    Going bed, gnight all! Good luck in your exam(s) tomorrow!!! Xxx
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    (Original post by kefalos23)
    Can someone link me the spec?
    http://filestore.aqa.org.uk/subjects...02-W-SP-14.PDF
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    (Original post by IAmAnTroll)
    Apparently the 6 marker is on quarrying advs + disadvs
    Thats what im assuming as well, could be on + and - of extracting metals, but they are both similar
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    (Original post by Obnox)
    What is cracking and how does it work?
    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.
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    thx
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    Explain how vegetable oils are extracted from plants?
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    (Original post by whyaqawhy)
    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.
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    What do hydrocarbons contain (2 marks)?
 
 
 
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