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    based on previous papers-what particular topics do you think are guarateed to come up?
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    i think the blast furnace and fraction distiallation always comes up...:p:
    thats about all i know
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    and theres always mole questions
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    (Original post by GiBB*)
    i think the blast furnace and fraction distiallation always comes up...:p:
    thats about all i know
    Theres nothing in my notes or in the revision books on blast furnaces. What topic is it under CD?.
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    (Original post by ratatouille)
    and theres always mole questions
    Which I cant do
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    God, when it asks me to find a formula or do an ionic equation (what the hell is that?!!) I just get lost.
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    (Original post by staylor)
    Which I cant do
    Oh gosh, moles are easy. One mole of whatever is just it's relative formula mass. You just divde the mass of your substance by its relative formula mass and you get how many moles.

    For example: There are 128 grams of copper. Coppers relative formula mass is 64. 128/64 = 2. And thats a simple one.
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    Yeah - theres loads ofunits and things which make no sense and which you have never heard of before, but it turns out they are in chemistry code which means each letter is substituted for the letter before it in the alphabet just to DAMN CONFUSE ME!!!
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    (Original post by soulsussed)
    Oh gosh, moles are easy. One mole of whatever is just it's relative formula mass. You just divde the mass of your substance by its relative formula mass and you get how many moles.

    For example: There are 128 grams of copper. Coppers relative formula mass is 64. 128/64 = 2. And thats a simple one.
    OMG it sounds so simple when you say it. I worked out how to do ti with ratios just to make it easier.
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    (Original post by Mr. Fox)
    God, when it asks me to find a formula or do an ionic equation (what the hell is that?!!) I just get lost.
    Ionic equations are showing the + - ions.
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    In every ionic reaction something is oxidised and something is reduced because something has to gain an electron and something ha to loose one. (remember digrams of ionic bonding) An ionic equation just shows this so you only put the ions. The product is usually balanced then I think.
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    I can do them easily enough

    Why is chemistry so much harder than the other sciences :confused:
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    (Original post by staylor)
    I can do them easily enough

    Why is chemistry so much harder than the other sciences :confused:
    I disagree, chemistry the easier one for me. Physics is the harder one.
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    (Original post by soulsussed)
    I disagree, chemistry the easier one for me. Physics is the harder one.
    physics is evil and should die i like it but i cant do it so glad im taking them all sepreatly so they dont affect each other
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    Would some1 be kind of to write up a summary of all the equations we need --like Metal+acid---> Salt+water etc. I know theres loads more but it wuld b gd to have 1 list to memorise
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    Acid + base = salt + water
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    Acid + Metal -> Salt + Hyrdrogen

    Acid + Metal-Oxide -> Salt + Water
    Acid + Metal-Hydroxide -> Salt + Water

    Acid + Carbonate -> Salt + Water + Carbon Dioxide
    Acid + Hydrocarbonate -> Salt + Water + Carbon Dioxide
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    (Original post by slobo)
    Acid + Metal -> Salt + Hyrdrogen

    Acid + Metal-Oxide -> Salt + Water
    Acid + Metal-Hydroxide -> Salt + Water

    Acid + Carbonate -> Salt + Water + Carbon Dioxide
    Acid + Hydrocarbonate -> Salt + Water + Carbon Dioxide
    Cheers!
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    i'm dreading anything to do with organic chemistry if i get esters i am stuffed all i know is pear drops!! wen studying esters our teacher gave us pear drops and told us to suck them lol, *reminisces* good old days*. also i can't do equilibrium and le chatelier's principle!!! ah wel
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    (Original post by soulsussed)
    Theres nothing in my notes or in the revision books on blast furnaces. What topic is it under CD?.
    extraction of metals fromt their ores.
 
 
 
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