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How was Chem 2 today? watch

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    btw, no reaction for adding NaOH to potassium sulphate?
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    (Original post by z!D4N)
    btw, no reaction for adding NaOH to potassium sulphate?
    no
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    (Original post by keisiuho)
    Yes.
    But there is no chlorine produced
    H2SO4 + 2NaCl -----> Na2SO4 + CL2 + H2 then?
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    (Original post by keisiuho)
    no
    YEAH!!
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    (Original post by Mathemagician)
    H2SO4 + 2NaCl -----> Na2SO4 + CL2 + H2 then?
    H2SO4 + NaCl --> NaHSO4 + HCl
    OR
    H2SO4 + 2NaCl --> Na2SO4 + 2HCl
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    (Original post by Mathemagician)
    H2SO4 + 2NaCl -----> Na2SO4 + CL2 + H2 then?
    nice equation. -_-'
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    (Original post by Mathemagician)
    H2SO4 + 2NaCl -----> Na2SO4 + CL2 + H2 then?
    If it is true, then hydrogen ions can oxidise chloride to chlorine
    then 2H+ + 2Cl- ---> H2 + Cl2

    Then HCl would become unstable and there would be no this compound!
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    (Original post by z!D4N)
    nice equation. -_-'
    .

    no probs....NOOOOO i messed up then! but Unit 3 is not worth much anyway only 50%.. I already got 49% for assessed practicals...
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    Remember, the people who could be bothered to come here are the people who care, who are in general the people who will do better becuase they put more effort in, so dont expect the grade boundries to be in the 90s!
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    (Original post by Mathemagician)
    H2SO4 + 2NaCl -----> Na2SO4 + CL2 + H2 then?
    hehehehe
    now i know your mistake
    you got the equation wrong
    it isnt Cl2 produced but HCL

    watch
    equation :
    NaCl + H2SO4 -------> HCl + NaHSO4
    There is no chlorine gas produced...
    check your text book on structure and bonding
    page 70
    its written there

    and one more thing..did you know that Cl2 is the one of the strongest oxdising agent
    ..in orderwords...very toxic if excessive Cl2 was present...
    now judging from the amount of people doing the test...how can you still be standing and writting your post here?
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    (Original post by minalth)
    Remember, the people who could be bothered to come here are the people who care, who are in general the people who will do better becuase they put more effort in, so dont expect the grade boundries to be in the 90s!
    Are you talking about yourself?
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    (Original post by MalaysianDude)
    hehehehe
    now i know your mistake
    you got the equation wrong
    it isnt Cl2 produced but HCL

    watch
    equation :
    NaCl + H2SO4 -------> HCl + NaHSO4
    There is no chlorine gas produced...
    check your text book on structure and bonding
    page 70
    its written there

    and one more thing..did you know that Cl2 is the one of the strongest oxdising angent..in orderwords...very toxic if excessive Cl2 was present...
    now judging from the amount of people doing the test...how can you still be standing and writting your post here?
    yeah, i'm wrong
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    (Original post by minalth)
    Remember, the people who could be bothered to come here are the people who care, who are in general the people who will do better becuase they put more effort in, so dont expect the grade boundries to be in the 90s!
    I agree to this!
    The people coming here are of high quality, which is best shown by the very high proportion of posts with rational discussions. In other forums, many are just throwing BS.
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    For the enthalpy change question (where the energy change was -891), i forgot to multiply the value of combustion of h2 by 2. i.e. i got -605.

    how many marks will i lose because of this (out of 3)?
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    hey guys... wats the equation for the 2nd electron affinity of nitrogen?! (paper 1)
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    (Original post by Tanaz)
    hey guys... wats the equation for the 2nd electron affinity of nitrogen?! (paper 1)

    n- + e- -----> n2-
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    (Original post by Hash)
    For the enthalpy change question (where the energy change was -891), i forgot to multiply the value of combustion of h2 by 2. i.e. i got -605.

    how many marks will i lose because of this (out of 3)?

    you'll probably get 1 or 2 marks if you got everyhing else ie method right
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    In the formation of PCl3 what was the oxidising agent?
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    (Original post by PaX)
    In the formation of PCl3 what was the oxidising agent?
    i put chlorine was the oxidising agent as it removed electron from the phosphorous..is it incorrect?!
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    (Original post by Hash)
    n- + e- -----> n2-
    Hmm you lose 1 mark I think it needed to be:

    N-(g) + e- --> N2-(g).

    Chlorine was the oxidisign agent- it was reduced (gained e-) and thereby oxidised P (0 -> +3 oxidation state). I think i got a good A in Unit 1.

    For the calculations did you get 108dm^3 for the 2nd question (412.5g for the first one or something??)
 
 
 
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