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    (Original post by CoventryCity)
    Does anybody have a good resource for these
    Transition metal colours in varying oxidation states
    Summary of all reaction of transition metals including colour changes
    Summary of acid - alkali, acid - metal, acid - carbonate reactions

    I just want to print this stuff off and stick it in my room
    No acid alkali ones though sorry xxx
    Attached Files
  1. File Type: docx transitionmetalreactions.docx (12.6 KB, 111 views)
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    Is this exam going to be pushed for time??
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    K= Rate / ((H2) x (NO)^2)

    3.6x10^-2 / ( (1.2x10^-2) x (6x10^-3)^2) = 8.3x10^4
    I'm doing this but it's still coming up wrong?

    i blame the calculator :laugh:
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    (Original post by Guinea Pig Lover)
    All sorts of weird and wonderful notes from my computer here, including a little worksheet thing I made to go through the specification

    Hope they help! x
    Thank you!!
    (i would rep, but ive ran out)
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    ffs am i an alien or something?
    or is no-one brave enough to tell me that they don't know how to do the question im asking help for?
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    (Original post by Flux_Pav)
    ffs am i an alien or something?
    or is no-one brave enough to tell me that they don't know how to do the question im asking help for?
    Type out the question?
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    The student diluted 25cm3 of a solution of hydrogen peroxide (h202) with water and made the solution up to 250cm3. he student titrated 25cm3 of this solution with 0.02moldm3 KMn04 under acidic conditions. The volume of kmno4 required was 23.45cm3. Calculate concentration in gdm-3 of the UNDILUTED h202 solution.

    Thanks for responding btw
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    (Original post by Guinea Pig Lover)
    All sorts of weird and wonderful notes from my computer here, including a little worksheet thing I made to go through the specification

    Hope they help! x
    that worksheet from the specification is great!
    did you have an answer scheme?
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    could someone please explain 1di of stretch and challenge to me on p.g 27. I know how to calculate the delta S an delta H but table gives the entropy and enthalpy of formation of No2. Should it not be CO2 as this is the product of thermal decomposition of magnesium carbonate is CO2 and not NO2
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    (Original post by Flux_Pav)
    The student diluted 25cm3 of a solution of hydrogen peroxide (h202) with water and made the solution up to 250cm3. he student titrated 25cm3 of this solution with 0.02moldm3 KMn04 under acidic conditions. The volume of kmno4 required was 23.45cm3. Calculate concentration in gdm-3 of the UNDILUTED h202 solution.

    Thanks for responding btw
    0.02 x 23.45/1000 =4.69x10^-4
    x 5/2 = 1.175x10^-3
    x10 =1.175x10^-2 moles
    x 34 =0.39865 g
    / 25/1000 =15.946 gdm^-3
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    (Original post by Flux_Pav)
    The student diluted 25cm3 of a solution of hydrogen peroxide (h202) with water and made the solution up to 250cm3. he student titrated 25cm3 of this solution with 0.02moldm3 KMn04 under acidic conditions. The volume of kmno4 required was 23.45cm3. Calculate concentration in gdm-3 of the UNDILUTED h202 solution.

    Thanks for responding btw
    moles mno4 = 4.69 x 10-4
    moles H2O2, you divide by 2 and times by 5 (from the previous part) = 1.1725x10-3

    then you x by 10 because (250/25) = 10

    so you get 1.1725x10-2 in 250cm3

    x by 40 to get it into dm3

    then x by the mr of H202 (34) to get the mass

    = 1.1725x10-2 x 40 x 34 = 15.9gdm-3
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    (Original post by volvicstar)
    that worksheet from the specification is great!
    did you have an answer scheme?
    No, sorry, but most of the questions are the worked examples from the book
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    (Original post by Guinea Pig Lover)
    All sorts of weird and wonderful notes from my computer here, including a little worksheet thing I made to go through the specification

    Hope they help! x
    I love you so so much right now!!
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    (Original post by jontylol)
    I love you so so much right now!!
    N'awww love you too!
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    (Original post by Guinea Pig Lover)
    No, sorry, but most of the questions are the worked examples from the book
    ok, thanks
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    Is der any difference between d-shell, d sub-shell, d-orbital? :/
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    (Original post by Guinea Pig Lover)
    No acid alkali ones though sorry xxx
    Thanks exactly what I needed love them
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    (Original post by haydyb123)
    http://www.youtube.com/user/bradyexp.../1/69n6KLvr_Uk
    Chemistry teacher at my college, some useful videos for this A2 Unit
    This guy is so GOOD. You're so lucky to have him!
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    Does anyone mind explaining buffers to me?
    /If it has already been covered here, could someone link me to the post?

    Thank you very much.
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    (Original post by apo1324)
    Does anyone mind explaining buffers to me?
    /If it has already been covered here, could someone link me to the post?

    Thank you very much.
    What don't you understand, and ill explain..
 
 
 
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