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    (Original post by Noor Tanveer)
    Another question how do we know the difference between giant covalent and simple molecular for e.g. SiCl4 and SiO2?
    On the official OCR textbook on page 87 it will show you how. Its where the element is positioned on the periodic table.
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    (Original post by Ché.)
    Sure!
    Right, so?
    Automatically, you would reference to Group Three considering the part "third"...
    We would then take the word "smallest" and it should trigger that it could be Boron as it will have less electron shielding have more of a strong nuclear attraction.

    So, once again referring to the term "the first twenty", Aluminium is spot on!


    Clear?


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    I GET IT:adore:

    oops just saw the next quwstion- dont get it
    the biggest change in the I.E. 's is between the 2nd and 3rd IE
    therefore doesnt it mean the the element should have 4 outer shell electrons and therefore be in group 4.
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    Can someone help me with this killer question q3di -

    http://www.ocr.org.uk/Images/61532-q...and-groups.pdf

    http://www.ocr.org.uk/Images/65127-m...roups-june.pdf

    Spent half an hour on this question and I just dont get it. Any help would be great.
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    (Original post by Kitnimohabbathai)
    guys whats the difference between si02 and sicl4? how do you work out what type of structure/bonding they have? I thought si02 would have permanent dipole-dipole? aren't they both covalent and simple molecular? is the difference that si02 is giant covalent but sicl4 isn't?

    SiCl4 - The charges all cancel out and form symmetrical shape.
    Thus, the molecule now simply...no lone pairs, no nothing.
    So, it'll obtain Van der Waals - as do most - and go from there!

    SiO2 - It'll have two bonding and lone pairs.
    Thus, it will be covalently bonded.
    This content isn't directly in the mark scheme but it helps discover the structures!

    .


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    (Original post by SchoolKid.)
    Can someone help me with this killer question q4di -

    http://www.ocr.org.uk/Images/61532-q...and-groups.pdf

    http://www.ocr.org.uk/Images/65127-m...roups-june.pdf

    Spent half an hour on this question and I just dont get it. Any help would be great.
    do you mean ci
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    (Original post by SchoolKid.)
    Can someone help me with this killer question q4di -

    http://www.ocr.org.uk/Images/61532-q...and-groups.pdf

    http://www.ocr.org.uk/Images/65127-m...roups-june.pdf

    Spent half an hour on this question and I just dont get it. Any help would be great.
    there is no Q4d(i)
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    (Original post by SchoolKid.)
    Can someone help me with this killer question q4di -

    http://www.ocr.org.uk/Images/61532-q...and-groups.pdf

    http://www.ocr.org.uk/Images/65127-m...roups-june.pdf

    Spent half an hour on this question and I just dont get it. Any help would be great.
    Is there a Question 4di) in this paper!?


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    (Original post by Legal drugdealer)
    do you mean ci
    Sorry I mean Q3di
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    (Original post by General SMG)
    there is no Q4d(i)
    I think they mean 3di the one on ionisation energies...you basically write out the electron configuration for aluminium...1s2,2s2,2p6,3s2,3p1. ..so the 1st is p...2nd and 3rd are S....
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    (Original post by SchoolKid.)
    Sorry I mean Q3di
    oo, I remember doing this question a little while ago, you have to look at the electron configuration of Al
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    (Original post by SchoolKid.)
    Sorry I mean Q3di
    Write out the electron config of aluminum actually that's a better way.
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    (Original post by SchoolKid.)
    Sorry I mean Q3di
    ANSWER:
    2nd, 3rd, 10th and 11th!

    STRATEGY:
    Write the electron configuration backwards per electron removal for all what you are given in a question..
    Wherever the s-orbitals are, in this context, you'll get it!


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    (Original post by Ché.)
    ANSWER:
    2nd and 3rd!

    STRATEGY:
    Write the electron configuration backwards per electron removal for all what you are given in a question..
    Wherever the s-orbitals are, in this context, you'll get it!


    Posted from TSR Mobile
    you're really good at explaining answers
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    hey have you guys done all the papers....I still have 2012 and 2013 left :/ did them ages ago..should I do them again now or just look through them?
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    (Original post by Kitnimohabbathai)
    I think they mean 3di the one on ionisation energies...you basically write out the electron configuration for aluminium...1s2,2s2,2p6,3s2,3p1. ..so the 1st is p...2nd and 3rd are S....

    (Original post by General SMG)
    oo, I remember doing this question a little while ago, you have to look at the electron configuration of Al

    (Original post by Legal drugdealer)
    Write out the electron config of aluminum actually that's a better way.

    (Original post by Ché.)
    ANSWER:
    2nd and 3rd!

    STRATEGY:
    Write the electron configuration backwards per electron removal for all what you are given in a question..
    Wherever the s-orbitals are, in this context, you'll get it!


    Posted from TSR Mobile
    Thank you ALL SOOO MUCH! I get it know...finally
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    (Original post by Kitnimohabbathai)
    you're really good at explaining answers
    Ah!
    Am I?
    Thank you very much; I really don't want to give badly explained answers for everyone to become distressed and all!
    I am glad I can give the right answers!

    How's everyone feeling overall for tomorrow?


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    (Original post by Ché.)
    Ah!
    Am I?
    Thank you very much; I really don't want to give badly explained answers for everyone to become distressed and all!
    I am glad I can give the right answers!

    How's everyone feeling overall for tomorrow?


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    hey have you guys done all the papers....I still have 2012 and 2013 left :/ did them ages ago..should I do them again now or just look through them?
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    (Original post by Kitnimohabbathai)
    hey have you guys done all the papers....I still have 2012 and 2013 left :/ did them ages ago..should I do them again now or just look through them?
    Don't put yourself under TOO much pressure in this instance!

    I would advise that you go through the questions and you'll gain a feel for nay new ways they ask questions which are stuff we really know!
    Reports help a little... You'll see how the commentary on how questions go; harder ones won't change but easier answers might incorporate that one mark MORE!

    You never know...
    Good luck!



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    (Original post by Kitnimohabbathai)
    hey have you guys done all the papers....I still have 2012 and 2013 left :/ did them ages ago..should I do them again now or just look through them?
    too scared to sleep...
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    Does anyone have any urging predictions for tomorrow!?



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