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IGCSE CHEMISTRY 2013 (May 20th & June 10th)

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    (Original post by Harris Ali)
    Hey, does anybody have to know whether we have to know about the individual observations about particular reactions of metals + water (so how potassium reacts and aluminum reacts) and how particular metals + acids react or do we just need to learn to general products created?
    I'd suggest you learn the general formulae for the reactions, general observations and how the reactivity increases/decreases with different elements.
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    I do hope they stick to the promise that the content in bold on the specification won't come up in Monday's exam.

    Does anyone have an idiot's guide to titration calculations? Like a few formulae?

    Just got 104/120 on a past paper. It's always the maths that lets me down! How is everyone doing with revision?
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    Just to get one thing right:

    For electrons, oxidation is loss and reduction is gain - but for oxygen, oxidation is gain and reduction is loss?
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    (Original post by Harris Ali)
    Hey, does anybody have to know whether we have to know about the individual observations about particular reactions of metals + water (so how potassium reacts and aluminum reacts) and how particular metals + acids react or do we just need to learn to general products created?
    Know the general pattern - for most 'what can she observe' questions, effervescence is ALWAYS one of the answers unless the metal is less reactive than the acid and no displacement takes place.
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    Hey guys, for any last minute run ups, about Salts, ion Tests and electrolysis, this page is very useful.
    http://en.wikibooks.org/wiki/GCSE_Sc...d_Electrolysis
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    Does anyone know what might come up in the paper. PLEASE I REALLY NEED TO KNOW. THANK YOU
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    (Original post by alexgr97)
    Just to get one thing right:

    For electrons, oxidation is loss and reduction is gain - but for oxygen, oxidation is gain and reduction is loss?
    Pretty much, yes Because the oxidising agent always get reduced, and the reducing agent gets oxidised! It's a little confusing, I know :P
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    for paper 1 , do you think we need to know about the more complex isomers e.g. 2,2, methylpropane? and if so how do you name them? i get the labelling of methyl groups but i just don't get the number in front of them?
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    (Original post by tw15st3d)
    for paper 1 , do you think we need to know about the more complex isomers e.g. 2,2, methylpropane? and if so how do you name them? i get the labelling of methyl groups but i just don't get the number in front of them?
    The highest number I've ever seen to be asked to draw is drawing two isomers of butene. Anyway, after you've found the longest carbon chain and you've got the methyl, then you look at the position of the extra carbon(s) that aren't in that carbon chain. Starting from either side, you count all the carbons until you get to the one that the extra group(s) come(s) off. That's the number.
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    How much of the chemical tests is going to come up on the paper? I've been learning then solidly!!
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    I'm a bit stuck on water of crystallisation could anyone please explain to me question 13)iii) on June 2012? It's a calculation and I just don't know how to do it! Thanks


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    (Original post by amalik_)
    I'm a bit stuck on water of crystallisation could anyone please explain to me question 13)iii) on June 2012? It's a calculation and I just don't know how to do it! Thanks


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    Hey I just did that same paper and basically all you have to do is use your answers from the previous question so for ZnSO4 you do 4.83\161 = 0.03
    then you do the same for the water which comes up with 0.21 and then you find the ratio to its 1:7 and therefore 7 is the value of x. - hope that helps
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    (Original post by jazzrules28592)
    Hey I just did that same paper and basically all you have to do is use your answers from the previous question so for ZnSO4 you do 4.83\161 = 0.03
    then you do the same for the water which comes up with 0.21 and then you find the ratio to its 1:7 and therefore 7 is the value of x. - hope that helps
    Thank you so much I get it now


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    exactly 17 hours till my exam!!! AHHHHHHHHHHHHH
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    Is everyone doing English language tomorrow as well?
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    Nope, tomorrow enligsh literature. Language was the 15th
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    (Original post by Dominicoben)
    Is everyone doing English language tomorrow as well?
    I did Language on Friday alr, It's English Literature tmr.
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    can someone please tell me the grade boundries for May 2012 1p? did you guys find it difficult?
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    (Original post by lina27)
    Please whenever anyone of you finishes the exam could you please write down some questions which appeared there? It would be really helpful as I'm no good in Chemistry. I've got my exam 20 hours from noww... quite nervous..
    There is an embargo on edexcel exams, so UK students may not talk about the exam until 4:30AM on the day after the exam. You won't get any info from us :P
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    (Original post by Dominicoben)
    Is everyone doing English language tomorrow as well?
    Yep I've got mine tomorrow too, and then maths and English lit the day after

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