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Chem OCR unifying concepts revision!!! watch

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    (Original post by CogitoErgoSum)
    ahh! that helps a lot!
    thank you!!

    dont know about my chances for the exam tomorrow, though!!
    Just do all the past papers and hope it's similar questions! For me it's like I know the formulas etc now but will I *still* know them by tomorrow afternoon.. I wish it was a morning exam!

    But good luck anyway
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    dont know about my chances for the exam tomorrow, though!!
    Now you understand how that question works, you'll be able to do all similar questions. I got stuck on that same question when I did it as a mock, but now I understand that question, I understand so many more! Good luck
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    (Original post by Jen05)
    Now you understand how that question works, you'll be able to do all similar questions. I got stuck on that same question when I did it as a mock, but now I understand that question, I understand so many more! Good luck
    yup! thats true! mocks are good help for actual exams! im thinking it being afternoon helps in a way!

    morning cram
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    morning cram
    Yep! Definately a good idea. I'm being way too relaxed tonight considering I've got 2 exams tomorrow. But I keep thinking, I've got the whole morning, may as well relax tonight! Hmmmm, maybe I should do something...
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    (Original post by Jen05)
    Yep! Definately a good idea. I'm being way too relaxed tonight considering I've got 2 exams tomorrow. But I keep thinking, I've got the whole morning, may as well relax tonight! Hmmmm, maybe I should do something...
    yep! im kinda like that! trying not to be and looking at papers.. but grrr lol! hard! maybe you should like.. check ya pms hehe :p:
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    (Original post by froggymills)
    Anyone sitting Chains, Rings and Spectroscopy? Im resiting it from January
    yeh me 2, dunno why cos i scraped a B. i was under the deluded impression last results day that i could somehow get an A!!!! im a fool. i dying majorily with uni concepts revision
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    Good luck to all ye chemists, may the (van der waals) force(s) be with u!
    ....oh dear that was bad
    .... exam dementia has set in again

    ..... we shall go down fighting til the bitter end! lol
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    (Original post by tishysquishy)
    Good luck to all ye chemists, may the (van der waals) force(s) be with u!
    ....oh dear that was bad
    .... exam dementia has set in again

    ..... we shall go down fighting til the bitter end! lol
    Someone's had chemistry revision overload..! :p:
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    Good luck everyone today
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    (Original post by violet)
    Someone's had chemistry revision overload..! :p:
    lol!! just a lil
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    everyones soo relaxed, im so doomed 4 this exam. havent had time 2 revise and i really really dont understand Buffer Sol's and some calculations. good luck everyone else tho!!!
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    teacher predicts theres gonna be a essay on buffer solutions
    the jan 05 paper was quite tough, hopefully this one will be easier, good luck to all
    • Thread Starter
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    gud luck everyone ...im tryin to do a last min cram revision session!!!!

    can anyone send me the jan 05 paper cos i swear i dnt hve it!!!!
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    (Original post by zaaks786)
    gud luck everyone ...im tryin to do a last min cram revision session!!!!

    can anyone send me the jan 05 paper cos i swear i dnt hve it!!!!
    http://www.emailed.org.uk/
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    BUFFER SOLUTIONS?!?! OH **** i thought that was Unit 5?!?! *panics* AAAAAAARGH!! Someone tell me about buffer solutions
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    (Original post by Bekaboo)
    BUFFER SOLUTIONS?!?! OH **** i thought that was Unit 5?!?! *panics* AAAAAAARGH!! Someone tell me about buffer solutions
    wel buffer solutions resist small changes in ph on the addition of small amounts of acid/alkali.
    They are made up of a weak acid and its sodium salt,

    e.g. Ethanoic acid and sodium ethanoate.

    CH3COOH ----> Ch3COO- + H+

    When you add an acid, it reacts with the CH3COO- , and removes any H+ ions, thus maintaning pH.....when you add alkali, it reacts with the H+....remving the OH-.

    Thats basicaly it....you find them in the blood, soaps, baby lotion....
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    Right ok i think i can remember that

    Must stop panicking
 
 
 
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