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    For the difference, I put: Solution Y may have had a higher initial temperature.


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    The backward reaction was endo. And yeah, equation 3 is correct.


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    I put that the triangle meant the temperature of the substance lol I will fail chemistry so bad
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    Yes I wrote 3
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    (Original post by Abodee1)
    Was the backward reaction endo or exo? I wrote endo
    And what equation was the right one ? I wrote 3 because it should have half the moles...
    Yh, both correct
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    (Original post by Year11Struggles;[url="tel:64950415")
    64950415[/url]]Yh, both correct
    Yay!!!,0 I feel so good right now because I totally messed up in bio but did really good In chemistry!!!
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    Is my ans for the difference correct?


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    (Original post by Droneon)
    For the difference, I put: Solution Y may have had a higher initial temperature.


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    Ohh.... I wrote because it was less Concentrated......
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    Also, I don't get how having a lower concentration would mean a higher temperature rise...?


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    How did you find the exam today?
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    The exam was actually pretty easy. That being said, hope they don't make paper 2 hard!


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    (Original post by Year11Struggles)
    For water I put:
    To remove residual solution X
    For solution Y I put:
    To remove water
    For why there is a difference I put:
    Solution Y has a lower concetration
    that's exactly what I wrote as well! :-)
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    I don't get it. Can someone explain it to me?


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    (Original post by Droneon)
    The exam was actually pretty easy. That being said, hope they don't make paper 2 hard!


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    I think we were doing different exams ((
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    (Original post by mahaaz.lone)
    There was hardly any organic chemistry on it! no blast furnace, no electrolysis, no iron or aluminium extraction.... FFS all the things i revise somehow are not in the test. Cheers edexcel you snakes
    It will be in the second paper
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    Well I did the IGCSE Edexcel Chemistry paper 1C today.


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    (Original post by mahaaz.lone)
    There was hardly any organic chemistry on it! no blast furnace, no electrolysis, no iron or aluminium extraction.... FFS all the things i revise somehow are not in the test. Cheers edexcel you snakes
    I know!!!! I felt that way too.. Snakes!!! Hiss off Edexcel! (Unless physics is a cakewalk.. Then I *might* be a little less annoyed) 😂
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    Does anyone understand the difference between HCl in water and methylbenzene?
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    (Original post by Alex.trin)
    Does anyone understand the difference between HCl in water and methylbenzene?
    in methylbenzene the ions (Cl- and H+) don't move freely in the solution so it stays neutral

    in water the are free to move (disassociate) and cause it to be acidic
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    (Original post by metellaest)
    Yes - that's the 'soluble + soluble' to make an insoluble salt (precipitate).

    The other methods are:

    'acid + excess base' which I think is just a solid (ie insoluble) added to an acid, which you then filter and use the four step method to obtain a pure, dry sample

    'titration - between an acid and an alkali if they you don't know the concentration of one or both' - it uses a soluble base

    I think it will be fairly obvious in the test, but if you have two aqueous solutions and you are obtaining a solid, do the precipitation reaction. If you have a solid and some acid, do excess base. If you have an unknown concentration of acids and/or alkalis, do a titration

    Based on past papers, I'd say it's most likely to be a titration...

    Good luck
    I have my exam tomorrow and I have absolutely no clue what that is! I haven't even come across it in my revision. Have you got any resources that can easily explain that to me, I'd really appreciate it... I'm so worried now...
 
 
 
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