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    (Original post by SmashedIt)
    can anyone help answer this, what properties make ethanol a useful solvent?
    Can dissolve stuff I think


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    (Original post by Willnewman234)
    Can dissolve stuff I think


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    Thanks, what about mixes with water?
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    Anyone else absolutely crapping it??
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    hey everyone,

    I know everybody probably answered this question a thousand times, but honestly can't be bothered to trawl back through the forum, so basically does anybody have any idea what the 6 mark 'QWC' questions could be for Unit 2 and 3? Just worried because yesterday's Biology transect question totally threw me!

    Really stressing out right now : /

    Thanks

    Sam
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    (Original post by Clintbarton)
    Anyone else absolutely crapping it??
    I certainly am
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    (Original post by SmashedIt)
    Thanks, what about mixes with water?
    Ethanol is a useful solvent because it mixes well with water which produces a neutral solution
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    (Original post by samstyan99)
    hey everyone,

    I know everybody probably answered this question a thousand times, but honestly can't be bothered to trawl back through the forum, so basically does anybody have any idea what the 6 mark 'QWC' questions could be for Unit 2 and 3? Just worried because yesterday's Biology transect question totally threw me!

    Really stressing out right now : /

    Thanks

    Sam
    My teacher analysed all past papers and she predicted that the six marker on unit 2 wil be on acids+base or precipitation, and titration on unit 3
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    https://m.youtube.com/watch?v=AHLXqGhZ1Gg also has predictions on unit three as well as good revision stuff for physics and chemistry. Explains all the maths bits well too. If you have a crappy teacher who doesn't care then this woman is brilliant lol
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    (Original post by molly2789)
    Can anyone help me out with electroplating? I know the basics but not enough for a 6 mark question on it :/
    Generally

    electrolysis is used
    positive anode is the thing you want to plate in ie silver or gold
    negative cathode is the thing you want to plate ie a goblet
    the electrolyte must contain ions of the plating element ie silver or gold
    this will be used to replace anode as it gets used up
    the Au, for example, will form a layer on the goblet or whatever is on the cathode
    it is used for make things look more attractive, and protecting them, and making them stronger

    thiz should secure 6 marks if it comes up, hope this alright. Feel free to correct if anything is wrong !
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    [QUOTE=Studentz001;55769171]Good luck to you too!
    I am very scared that the exam will have questions on hard and soft water. I think I know the basics, but not much on how hard water is softened and purified. Could you please help me?![/QUOTE


    Water is purified by filtering it to remove solid particles then chlorine is added to kill microbes. Silver nanoparticles can also be added to kill microbes. Fluoride is added too to help prevent tooth decay. You need to know some advantages and disadvantages of chlorination and fluoridation.
    Temporary hard water is softened by boiling it because the calcium hydrogencarbonate decomposes to form calcium carbonate (scale), removing the calcium ions from the water. Permanent hard water can be softened by adding sodium carbonate (washing soda) or passing it through an ion exchange column containing ion exchange resin with sodium or hydrogen ions in it, so when the water flows through the calcium or magnesium ions are replaced by the sodium or hydrogen ions so it is softened. Hope that helps!
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    (Original post by SmashedIt)
    My teacher analysed all past papers and she predicted that the six marker on unit 2 wil be on acids+base or precipitation, and titration on unit 3
    thanks ! I'm too stressed to do any proper revision right now, but I'll go over my titration notes on the way to school tomorrow : ) good luck!!!
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    (Original post by Jules12345)
    what do we think for six marker on c2?????
    Always a method of reaction
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    - Useful video for anyone having issues with titrations- this was really helpful and lays out titrations in a simple and easy way.

    I have the feeling that the QWC will be on either electrolysis or bases, alkalis and acid reactions

    This is my first post so please forgive me if the etiquette is off!
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    (Original post by samstyan99)
    hey everyone,

    I know everybody probably answered this question a thousand times, but honestly can't be bothered to trawl back through the forum, so basically does anybody have any idea what the 6 mark 'QWC' questions could be for Unit 2 and 3? Just worried because yesterday's Biology transect question totally threw me!

    Really stressing out right now : /

    Thanks

    Sam
    I think it will be on either electroplating or making salts
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    Thank you so much
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    (Original post by SmashedIt)
    My teacher analysed all past papers and she predicted that the six marker on unit 2 wil be on acids+base or precipitation, and titration on unit 3
    for the unit two one does that mean making salts equations and experiments??:confused::confused:
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    Water is purified by filtering it to remove solid particles then chlorine is added to kill microbes. Silver nanoparticles can also be added to kill microbes. Fluoride is added too to help prevent tooth decay. You need to know some advantages and disadvantages of chlorination and fluoridation.
    Temporary hard water is softened by boiling it because the calcium hydrogencarbonate decomposes to form calcium carbonate (scale), removing the calcium ions from the water. Permanent hard water can be softened by adding sodium carbonate (washing soda) or passing it through an ion exchange column containing ion exchange resin with sodium or hydrogen ions in it, so when the water flows through the calcium or magnesium ions are replaced by the sodium or hydrogen ions so it is softened. Hope that helps![/QUOTE]

    What are the advantages and disadvantages of chlorination and fluoridation?
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    I found the empirical formula easy if you inderstand the basic steps. First find the mass of the atoms present and their Ar. Then divide the mass by the Ar for each. Then divide each answer through by the smallest. This gives the whole number ratio which equals the empirical formula. I know this sounds confusing but I hope it helps a bit.
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    I don't know how to explain titration..don't really understand it and I'm scared there will be a 6 marker on it! anyone have a simple explanation or resources??
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    (Original post by kevinspl2000)
    I think it will be about the comparison of thermosoftening and thermosetting polymers
    That would be a dream of a question (:
 
 
 
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