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    (Original post by M | k e)
    Something about why is Copper(II) ions blue?

    I said the d subshell splits when ligands attach, forming levels of different energy. The electrons in it require energy = delta E to make the jump to higher energy level. They get this energy by absorbing light, in copper then absorb red light, and reflect the rest, because red is absorbed this mean blue gets reflected and is visible at this colour .

    Not 100% about my physicsy stuff but it's along those lines
    i wrote blue is absorbed lol but the rest looks similar
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    (Original post by Betsss)
    For why copper (II) ions are blue, i put:
    - Cu2+ is a transition metal ion, so it has an incomplete d-sublevel
    - it can undergo d-to-d transitions
    - the electrons absorb light, which excites them to a higher energy level
    - they then emit light to fall back to ground state
    - Cu2+ ions absorb red light from the visible spectrum; so they will appear the complementary colour (blue)

    Is this ok, this was the section i was least confident with and it had to come up!!
    wow thats full mark!
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    (Original post by al_habib)
    wow thats full mark!
    Was just a standard 'Learn this' question How does everyone else feel about the exam?
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    what did everyone get for the enthalpy of the 2 mol of NH3?
    Also NO POINT IN LERANING ALL THE COLOURS! absolute waste of time
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    Agreed on the pointlessness of learning colors, although there was a fair amount of applying what you learn from equations on the paper
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    (Original post by Zakir)
    what were the two shapes that the palladium complex could have and the coordination number?
    i put tetrahedral and square planar.... but i could be wrong.. :/
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    what did people put for the ionic equation for Al203 and Hcl. i just wrote the full equation, as i didn't think it could be simplified
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    (Original post by happi_minnie)
    i put tetrahedral and square planar.... but i could be wrong.. :/
    That looks about right, they are the only ones a 4 bonded species.
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    (Original post by lou12)
    what did people put for the ionic equation for Al203 and Hcl. i just wrote the full equation, as i didn't think it could be simplified
    I don't think it did simplify, was another "Just Learn" question.
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    how did everyone find the exam
    i thought it was k but hated the deltaE=hv question cos i didnt learn it as i was least confident with that section
    and wtf no colours well only 2 marks and i wasted my time learning them all
    overall im k with the paper but some people in my class found it hard
    and i liked the two questions on entropy and the question on periodicity
    my predicted grade boundaries will be same as jan 2011 grade boundaries i think but it also depends on how other people did
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    What did people get for the percentage in the last question?
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    (Original post by happi_minnie)
    what did everyone get for the enthalpy of the 2 mol of NH3?
    Also NO POINT IN LERANING ALL THE COLOURS! absolute waste of time
    i got +38 i think cant remember it was a bit of a trick question cos it sed one mole of ammonia but it showed 2 moles in the question
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    (Original post by king101)
    I don't think it did simplify, was another "Just Learn" question.
    I did Al3+ + 4OH- -> [Al(OH)4]-
    because the Na and water were spectator ions?
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    (Original post by -jessica)
    What did people get for the percentage in the last question?
    i think my answer was 53.6 or 58.3 percent cant remember hoping someone else got one of these answers too
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    (Original post by -jessica)
    What did people get for the percentage in the last question?
    i got something like 53.7%
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    (Original post by -jessica)
    What did people get for the percentage in the last question?
    Something in the range of 53.7, cannot really remember.
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    for the ligand question was the answer hydrogen because it doesnt have a lone pair of electrons it cud donate

    and also for the redox what was the answer to 5f where there were 2 graphs
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    (Original post by Betsss)
    I did Al3+ + 4OH- -> [Al(OH)4]-
    because the Na and water were spectator ions?
    Looks right, cant remember what i did though :P
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    (Original post by Betsss)
    I did Al3+ + 4OH- -> [Al(OH)4]-
    because the Na and water were spectator ions?
    fml did it say ionic equation not full equation? ahhh fml, i kept na in and put it to naal(0h)4 , thatll teach me to read questions properly
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    (Original post by magicalelf)
    fml did it say ionic equation not full equation? ahhh fml, i kept na in and put it to naal(0h)4 , thatll teach me to read questions properly
    I think it did ask for Ionic.
 
 
 
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