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Edexcel IAL Chemistry Unit 01 - 26th of May, 2017 Watch

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    (Original post by annbee)
    positive 30 something kJ/mol
    I use 0.0952 mol
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    (Original post by annbee)
    positive 30 something kJ/mol
    yeah i got the same answer
    did you use the mol value for the excess or the limiting?
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    (Original post by annbee)
    I use 0.0952 mol
    yeah okay i just saw your reply
    thanks
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    (Original post by mr.holmes)
    what did you find the enthalpy change per mol?
    i divided 3.01........(kJ)by 8/84(limiting reactant moles)
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    (Original post by Crystal_M)
    i divided 3.01........(kJ)by 8/84(limiting reactant moles)
    what did you fill the table for the Born-Haber cycle?
    and what was the species that give the 28 mass to charge ratio?
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    I filled the table with around 7000

    And the 28 m/e was Iron Fe²+

    Posted from TSR Mobile
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    (Original post by mr.holmes)
    what did you fill the table for the Born-Haber cycle?
    and what was the species that give the 28 mass to charge ratio?
    i dont remember exactly but i put the atomisations, electron affinity and enthalpy of formation.

    i didnt know the species. i left it blank because it was only i mark. what did you put?
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    guys what did u put for how the pi bond is formed and y it can undergo addition reactions, first part i wrote pi bonds form due to the overlap of p orbitals
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    (Original post by Crystal_M)
    i dont remember exactly but i put the atomisations, electron affinity and enthalpy of formation.

    i didnt know the species. i left it blank because it was only i mark. what did you put?
    i put it Fe2+
    i am not sure though
    it is just a one mark anyways.

    what did you write for the question asking about the pi bond?
    and in the MCQ, what was the answer for the second monomer? i chose propene.
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    (Original post by Shamin06)
    guys what did u put for how the pi bond is formed and y it can undergo addition reactions, first part i wrote pi bonds form due to the overlap of p orbitals
    i wrote the same as you for the first part.
    i wrote for the second part that it is an electron dense area and it makes the molecule weaker so it breaks up to allow the joining of the halogens.
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    (Original post by kevandowski)
    I filled the table with around 7000

    And the 28 m/e was Iron Fe²+

    Posted from TSR Mobile
    what was the 7000? which table?
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    (Original post by mr.holmes)
    i put it Fe2+
    i am not sure though
    it is just a one mark anyways.

    what did you write for the question asking about the pi bond?
    and in the MCQ, what was the answer for the second monomer? i chose propene.

    Fe2+ is correct i think
    For the pi bond: i put about it being above and below plus the overlap of two p orbitals
    For the MCQ i put Proprene too
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    (Original post by mr.holmes)
    i wrote the same as you for the first part.
    i wrote for the second part that it is an electron dense area and it makes the molecule weaker so it breaks up to allow the joining of the halogens.
    i said it attracts electrophiles which can be halogens
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    (Original post by Crystal_M)
    i said it attracts electrophiles which can be halogens
    I also wrote how pi bond repels electrons in halogens, inducing temporary dipoles which can then be electrophiles
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    (Original post by Crystal_M)
    i said it attracts electrophiles which can be halogens
    what did you get the ppm value?
    you convert it to mg right?
    and what did you get the simplest empirical formula? the one about the oxide and you subtract to get the mass?
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    (Original post by Shamin06)
    I also wrote how pi bond repels electrons in halogens, inducing temporary dipoles which can then be electrophiles
    the question was for two marks right?
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    (Original post by mr.holmes)
    what did you get the ppm value?
    you convert it to mg right?
    and what did you get the simplest empirical formula? the one about the oxide and you subtract to get the mass?
    PPM value i got 2.7
    Simplest empirical formula was so confusing but i put Cr2O3
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    (Original post by mr.holmes)
    the question was for two marks right?
    Yup
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    (Original post by Crystal_M)
    PPM value i got 2.7
    Simplest empirical formula was so confusing but i put Cr2O3
    i got it as 2.7x10^3 did you convert the unites?
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    (Original post by mr.holmes)
    what was the 7000? which table?
    There was a table for ionisation energy for magnesium, 1st, 2nd, 4th and 5th were given, we had to calculate the possible value for the 3rd one.
 
 
 
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