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Chemistry ATP (Important points for Both IGCSE and O-level)

Discussion in 'Cambridge O Levels' started by Nibz, May 24, 2011.

  1. Nibz

    Nibz XPC Global Moderator Staff Member

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    One is a physical test and the other is a chemical test!
    If they ask for the physical one => Use the 'boiling point' method!
    If a chemical test is being asked, then mention one of the two tests I've provided!
     
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  3. TatsuEG

    TatsuEG

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    I am not sure but I think those measure the presence of water , not purity :)
     
  4. ayusuf1234

    ayusuf1234

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    chemistry sucks i have the exam tomorrow and its 11.30 pm and i dont know anything
    i just wanted to share my pain . lol
     
  5. ayusuf1234

    ayusuf1234

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    and btw that is a test for Purity if u want a test for the presence of water then use anhydrous copper sulphate (White-Blue) or cobalt chloride paper.
     
  6. scarface007

    scarface007

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    walikum as salam
    thnk u soo much fr dese notes :)
     
  7. respect1

    respect1

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    Are we even supposed to know about this indicator?? It's the first time i am hearing it...Is it in the syllabus?
    Thanks :)
     
  8. respect1

    respect1

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    And one more thing Nibz, isn't adding a carboxylic acid a test for ethanol?
    You get a pleasant smelling substance which is an ester.. :)
     
  9. xIshtar

    xIshtar

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    It is one possible test, but a lit splint which burns is also one..
     
  10. TatsuEG

    TatsuEG

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    It's not recommended in the chemistry syllabus , only Methyl orange and Phenophthanil which is used in Titration :)


    Also Universal Indicator and Litmus paper but don't use those in Titration
     
  11. JiViFiDi

    JiViFiDi

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    I'd write something witty here, but then u wouldnt
    why thank u. what goes around, comes around. i was good at bio, and i helped alot of people out, and my weak point is chem. i didnt study squat for the ppr6, and u saved my ass. thanks
     
  12. himanshu1995

    himanshu1995

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    <Comment Removed>

    ---You shouldn't discuss the paper before 24 hours!---
     
  13. XPFMember

    XPFMember XPC Moderator Staff Member

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    Assalamoalaikum!!

    I guess it's late now! Paper's over already! :(
     
  14. KHuSHaL_KaMaL..007

    KHuSHaL_KaMaL..007

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    dude, its Nitrogen Dioxide
    Justin Bieber was caught smoking weed. In related news, weed just got a lot less cool
     
  15. Sijal Mirza

    Sijal Mirza

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    In Fermentation, how can carbondioxide escape if bung is used? :/
     
  16. Sijal Mirza

    Sijal Mirza

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    and in oxidising agents part.. (VI) and (VII) what are these?
    cant be their oxidation states :/
     
  17. bubbles1997

    bubbles1997

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    Aoa. Can anyone help me with oxidising agents and reducing agents? I don't understand it.... :(
    Please list the names...
     
  18. Sijal Mirza

    Sijal Mirza

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  19. Sijal Mirza

    Sijal Mirza

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    An oxidising agent (also oxidant, oxidizer or oxidiser) is a substance that oxidizes (removes electrons from) another reactant in a redoxchemical reaction. The oxidising agent is reduced by taking electrons onto itself and the reactant is oxidised by having its electrons taken away.

    A reducing agent (also called a reductant or reducer) is the element or compound in a reduction-oxidation (redox) reaction that donates an electron to another species; however, since the reducer loses an electron we say it is "oxidized". This means that there must be an "oxidizer"; because if any chemical is an electron donor (reducer), another must be an electron recipient (oxidizer). Thus reducers are "oxidized" by oxidizers and oxidizers are "reduced" by reducers; reducers are by themselves reduced (have more electrons) and oxidizers are by themselves oxidized (have fewer electrons).

    P.S. I do not own anything.
     
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  20. Sijal Mirza

    Sijal Mirza

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    Redox reactions, or oxidation-reduction reactions, have a number of similarities to acid-base reactions. Fundamentally, redox reactions are a family of reactions that are concerned with the transfer of electrons between species. Like acid-base reactions, redox reactions are a matched set -- you don't have an oxidation reaction without a reduction reaction happening at the same time. Oxidation refers to the loss of electrons, while reduction refers to the gain of electrons. Each reaction by itself is called a "half-reaction", simply because we need two (2) half-reactions to form a whole reaction.
     
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  21. bubbles1997

    bubbles1997

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    Thanks, you've been a great help! :)
     
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