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    does anyone put the marks scheme up like they do in the maths thred in the chemistry threads?
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    (Original post by happi_minnie)
    does anyone put the marks scheme up like they do in the maths thred in the chemistry threads?
    Don't think anyone really does a mark scheme for Chemistry
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    COLLEGE/A-LEVELS/CHEMISTRY are officially over, I am so happpppppppppppppppppppppppppppp pppppppppppppppppppppyyyyyyyyyyy yy

    and the exam wasnt too bad either so I should be getting the A i worked SO hard for, for 2 years
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    (Original post by Scaudwell)
    Fe 2+ ---> Fe 3+ + e-

    Cr2O7 2- + 14H+ + 6e- ---> 2Cr 3+ + 7H2O

    THEREFORE: 6Fe 2+ + Cr2O7 2- + 14H+ ---> 2Cr 3+ + 6Fe 3+ + 7H2O


    That's how you get your ratio.
    do you get a mark writing the equation coz i didnt finish the calc
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    (Original post by al_habib)
    do you get a mark writing the equation coz i didnt finish the calc
    Defiantly, probably two marks since it isn't really the most easiest equation.
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    (Original post by king101)
    I don't think it did simplify, was another "Just Learn" question.
    cool thanks
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    did anyone else put that the voltage of the cell decreases over time because KCL gets used up in the salt bridge?
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    (Original post by king101)
    Defiantly, probably two marks since it isn't really the most easiest equation.
    among the elements, which one was not a ligand- i put H was it right
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    for one of the emf questions, did anyone reverse the direction of the reaction when writing out an equation. i can't remember what the question was now.
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    (Original post by al_habib)
    among the elements, which one was not a ligand- i put H was it right
    I said H2 because it doesnt have any lone pairs so can not coordinatly bond
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    (Original post by al_habib)
    among the elements, which one was not a ligand- i put H was it right
    H2 was right
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    (Original post by Black Butler)
    did anyone else put that the voltage of the cell decreases over time because KCL gets used up in the salt bridge?
    i didn;t really know what to put for that so i just said the electrodes are used up/. only 1 mark
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    (Original post by Black Butler)
    H2 was right
    woop
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    (Original post by Betsss)
    woop
    i made a lot of silly mistakes too.
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    (Original post by Black Butler)
    i made a lot of silly mistakes too.
    yeah same i need an A* in this as well to meet my offer! :/
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    If I put sulfur reacts with oxygen producing blue light and a colourless gas produced, will that get me the marks?
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    (Original post by l4ith)
    If I put sulfur reacts with oxygen producing blue light and a colourless gas produced, will that get me the marks?
    SO2 is a yellow gas.
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    (Original post by Black Butler)
    SO2 is a yellow gas.
    No, it's colourless. Check pg 188 Nelson Thornes.

    ''... it burns with a blue flame to form the colourless gas sulfur dioxide''
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    (Original post by l4ith)
    If I put sulfur reacts with oxygen producing blue light and a colourless gas produced, will that get me the marks?
    *Sigh*
    If my textbook is correct, then yes
    Mind you.. my textbook has been wrong before
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    (Original post by Black Butler)
    SO2 is a yellow gas.
    It is colourless. Solid sulphur is yellow
 
 
 
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