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    (Original post by bagabaga)
    fo the hess cycle question i got -126 kj was thatwhat you all got??
    and fo tenergy trasferes i got 9140/0.0037
    -2470 kj??

    (Original post by 1992)
    yep i got -126KJ for Hess's
    not the same answer for the enthalpy change though... :s
    I'm pretty sure it's.
    -4003 - (-4163) = 160 kJ/mol (We don't use hydrogen enthalpy because it is an element.)

    Hope i helped.
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    I have to go out now so i'll finish the answers later on this evening.
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    am i the only one that can never remember what i put in the exam
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    1-c
    2-c (think its wrong
    3-b
    4-b
    5-c
    6a-b
    6b-a
    6c-d
    7-c
    8-d
    9-d
    10-c
    11-b
    12-a
    13-b
    14a-a
    14b-d
    14c-c
    14d-b
    15-c

    i havwnt got them all right but these were my answerrs
    i found multiple choice easy i just lost marks for not reading question properly
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    for 16
    the salt formed in aqueous not solid
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    (Original post by Spongebob*No*Pants)
    I'm pretty sure it's.
    -4003 - (-4163) = 160 kJ/mol (We don't use hydrogen enthalpy because it is an element.)

    Hope i helped.

    But considering they are talking about combustion wouldnt we expect a -ve answer?
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    -4289kj -(-4163)=-126 and yes you do use hydrogen because you need to break the binds to form water
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    if the dont want us to use the hydrogen then why bother giving us the information!!!
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    i calculated how many marks i got in this hole paper and it only makes 41/80 which is less than 50% so that a D
    ive failedddddddddddddddddddd
    nooooooooooooooooooooooooooooooo oooooooooooooooooooooooooooooooo

    rresit in june defo
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    (Original post by Spongebob*No*Pants)
    Yep you're absolutely right, didn't read the 2nd Ionisation energy bit even though it's in bold lol
    Shouldn't it be C! Since the highest ionization energy is the I.E of a noble gas, which is B, and the proceeding one is a group 1 element. :O
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    for the 1st question on section b
    what are the state symbols
    im sure the mgcl2 is a aqueous not solid
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    what did everyone put for 18d iii)

    it gives us a table and asks why they are similar
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    (Original post by Spongebob*No*Pants)
    Blue to the neg and yellow to the positive.
    But nickel is green in colour... SO3 is not a yellow ion
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    (Original post by Spongebob*No*Pants)
    I'm pretty sure it's.
    -4003 - (-4163) = 160 kJ/mol (We don't use hydrogen enthalpy because it is an element.)

    Hope i helped.
    I got -126 kJ/mole which I think is the right answer because in the next question all of them have almost the same values.. And all are close to each other (in terms of numbers of carbons).

    It is impossible to get an endothermic value here.. :O
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    I wanted to get a hundred would get a 90 now that the paper was hard.
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    hi could anyone send me the chemistery paper for unit 1 jan 2010.
    [Mod Edit: Email address removed. Please use the Private Message system instead to contact other members.]

    thanks in advance
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    Can we use gel pens to write in the paper??
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    I'm sure that I've now got 30/80.
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    (Original post by Tzarchasm)
    I'm sure that I've now got 30/80.
    How are you sure??
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    Okay I agree with everything but I think this is right:
    6b. A - this is because it must be a halogen since only halogens form a bond with H in that way. Therefore, it has to be the second highest first ionisation energy from the list, which must be A.
    6c. D - this is because it must be an element in group 6, and so it would have the third highest first ionisation energy from the list, which must be D.

    and finally,

    8. D - because Al has atomic number 13, which means its electron configuration is 1s2 2s2 2p6 3s2 3p1 and so you would remove it from 3p 3s 3s 2p 2p, which is D.

    Finally,
    18. d. ii. is -126kJmol-1 - this is because you must include H2 since it is being burned. you only don't include elements for the enthalpy of formation because you can't "form" an element since enthalpy of formation refers to the formation of compounds.

    I agree with everything else though.
    Feel free to correct me guys.

    I think I got about 90+
 
 
 
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