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    Anu clues about today chemistry paper
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    What are the conditions for cracking that we need to know? (heat and pressure)

    What are the conditions for the production of ethanol?
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    (Original post by holly24601)
    What are the conditions for cracking that we need to know? (heat and pressure)

    What are the conditions for the production of ethanol?
    Cracking ; Temperature : 600-700 Celsius , Pressure: 1 atm (normal pressure) , Catalyst: Al2O3 or SiO2

    Ethanol: Industrial Method: Temperature: 300 Celsius, Pressure 60 atm, Catalyst: H3PO4
    Ethanol: Fermentation Method: Temperature:30-35 Celsius, Catalyst: Yeast, Anaerobic conditions
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    (Original post by Amandipeiris)
    Cracking ; Temperature : 600-700 Celsius , Pressure: 1 atm (normal pressure) , Catalyst: Al2O3 or SiO2

    Ethanol: Industrial Method: Temperature: 300 Celsius, Pressure 60 atm, Catalyst: H3PO4
    Ethanol: Fermentation Method: Temperature:30-35 Celsius, Catalyst: Yeast, Anaerobic conditions
    Thank you!
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    (Original post by Amandipeiris)
    Cracking ; Temperature : 600-700 Celsius , Pressure: 1 atm (normal pressure) , Catalyst: Al2O3 or SiO2

    Ethanol: Industrial Method: Temperature: 300 Celsius, Pressure 60 atm, Catalyst: H3PO4
    Ethanol: Fermentation Method: Temperature:30-35 Celsius, Catalyst: Yeast, Anaerobic conditions
    Ethanol is paper 2
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    GOOD LUCK EVERYONE ❤️


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    Best of luck! 2 hours until the exam
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    Good luck everyone!!!


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    How did everyone find the exam? I thought it went pretty well. Especially compared to Biology!

    One question though...why do you put the glass rod in the solution!?
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    My answer was that you should use the glass rod to feel if crystals have been formed - wasn't confident with the answer though
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    What did you get for x?
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    I got 7, i think
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    I got 5 but not sure about that - got two different answers!


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    I found it somewhat difficult compared to the past papers ive been doing..
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    (Original post by MarimbaMofo)
    I got 7, i think
    Me too but it was a decimal that rounded up to 7
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    (Original post by solark)
    I found it somewhat difficult compared to the past papers ive been doing..
    Me too, there were quite a few 3 mark experiment questions that I didn't really have a clue how to answer :/
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    I struggled with 3 bits. What did people put for the very last question as to the 2nd reason for increase in rate of reaction as temperature increased?

    I started to write that the teacher must have broken up the solid in smaller chunks, but then crossed it out as I figured that would increase the rate regardless of temp.rise. Plus the fact that it had already been touched upon with the iron filings in another question, so thought they wouldn't ask the same thing twice
    So I ended up putting that the water particles receive more kinetic energy as the temp.increased so they breach the activation energy required more easily.

    Also I'm not confident about m,y answer to the ionic equation they asked us to write. I ended up putting: 2Na+ + At2- plus Cl2 gives 2(Na+ Cl-) plus At2. Something like that anyway.
    Dunno if I'd be penalised for putting in the sodium spectator ions.

    And the magnesium sulfate crystals question... what did peeps put for the formulae of the 2 substances in the filtrate?
    I put water (H20) that wasn't crystallised and also MgS04. I nearly put sulfuric acid in case it was in excess but the question didn't state that.
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    (Original post by Darwinion)
    I struggled with 3 bits. What did people put for the very last question as to the 2nd reason for increase in rate of reaction as temperature increased?

    I started to write that the teacher must have broken up the solid in smaller chunks, but then crossed it out as I figured that would increase the rate regardless of temp.rise. Plus the fact that it had already been touched upon with the iron filings in another question, so thought they wouldn't ask the same thing twice
    So I ended up putting that the water particles receive more kinetic energy as the temp.increased so they breach the activation energy required more easily.

    Also I'm not confident about m,y answer to the inonic equation they asked us to write. I ended up putting: Na+ + 2At- plus Cl2 gives Na+ Cl- plus At2
    Dunno if I'd be penalised for putting in the sodium spectator ions.

    And the magnesium sulfate crystals question... what did peeps put for the formulae of the 2 substances in the filtrate?
    I put water (H20) that wasn't crystallised and also MgS04. I nearly put sulfuric acid in case it was in excess but the question didn't state that.

    i know right I found it hard too! Especially the last question - there I talked about more frequent and successful collisions, and also the fact that the ethyne gas expands in hot temperatures...that was a guess! I didn't want to say 'so less space so the particles collide more' because sometimes in qs like that if you put that you get 0/3...So hard!!
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    (Original post by solark)
    Me too but it was a decimal that rounded up to 7
    I got 7 for that. If you rounded to 2 decimal places it was 0.07 and 0.49 so ratio was 1:7..... I think.
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    What did people get for the percentage of oxygen in air?? Cos my answer was 28% which wasn't very near 21% :/
 
 
 
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