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OCR Chemistry F321 Exam. - [Next Tuesday[

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    (Original post by Pride)
    yep. It's normally not hard to work out.

    What is NaClO3?

    Spoiler:
    Show
    sodium chlorate (V) remember ox number always after the element it's describing, I lost a mark once for saying sodium (V) chlorate
    i get it now thanks how was bio for you by the way hope it went well! can u please pride give me hard questions in chem like application
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    I hope its not hard like jan 2012 paper... hopefully!

    i heard that.. June papers are usually easier but den the grade boundary would be so high :/
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    (Original post by Asyfa)
    I hope its not hard like jan 2012 paper... hopefully!

    i heard that.. June papers are usually easier but den the grade boundary would be so high :/
    it was pretty hard (I did it as a mock in my school)

    generally june papers are easier but hey, it's not always like that.
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    (Original post by Pride)
    it was pretty hard (I did it as a mock in my school)

    generally june papers are easier but hey, it's not always like that.
    can you ask me more questions?
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    Guys do you know where I can find the JAN 2012 past paper and mark scheme for unit-1 ?
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    (Original post by Najeeb.B)
    Guys do you know where I can find the JAN 2012 past paper and mark scheme for unit-1 ?
    http://www.thestudentroom.co.uk/misc...ents&t=1943168

    There you go bro
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    (Original post by otrivine)
    i get it now thanks how was bio for you by the way hope it went well! can u please pride give me hard questions in chem like application
    I thought bio went well, it was difficult, but I think I handled it alright.

    ok, let me look at some past papers in my folder

    'ICl has a higher boiling point than Cl2, explain in terms of intermolecular forces present, why ICl has a higher boiling point than Cl2.' 2 marks

    describe a chemical test which a student could carry out to prove that the filtrate contains aqueous chloride ions. 2 marks.

    hyrdrated copper II nitrate has the empirical formula CuN2O12H12
    write the formula of hydrated copper nitrate to show its water of crystallisation.
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    (Original post by Pride)
    I thought bio went well, it was difficult, but I think I handled it alright.

    ok, let me look at some past papers in my folder

    'ICl has a higher boiling point than Cl2, explain in terms of intermolecular forces present, why ICl has a higher boiling point than Cl2.' 2 marks

    describe a chemical test which a student could carry out to prove that the filtrate contains aqueous chloride ions. 2 marks.

    hyrdrated copper II nitrate has the empirical formula CuN2O12H12
    write the formula of hydrated copper nitrate to show its water of crystallisation.
    1) ICL has more number of electrons and has greater intermolecular forces (van der waals forces) and therefore more energy needed to break intermolecular forces
    2) Silver nitrate and if CL- present forms white ppt
    3) Cu(No3)2 . 6H2O
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    unfortunately the link is not work
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    (Original post by Najeeb.B)
    unfortunately the link is not work
    The link is also on page 3 of this thread. It works for me.
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    Im soo worried about the exam tomorrow!! D:
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    (Original post by Neena)
    Im soo worried about the exam tomorrow!! D:
    What topics are you stuck on?
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    (Original post by otrivine)
    1) ICL has more number of electrons and has greater intermolecular forces (van der waals forces) and therefore more energy needed to break intermolecular forces
    2) Silver nitrate and if CL- present forms white ppt
    3) Cu(No3)2 . 6H2O
    great. in question 2, they can be picky and say AQUEOUS silver nitrate, but probably not for 2 marks.
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    (Original post by Pride)
    great. in question 2, they can be picky and say AQUEOUS silver nitrate, but probably not for 2 marks.
    Thanks for telling me i will be aware of that
    ok
    1)How would you carry out a acid-base titration(3)
    2) What colour does methylorange give in acid?
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    (Original post by Neena)
    Im soo worried about the exam tomorrow!! D:
    answer some of our questions, you'll do fine if you've been revising ok?

    define relative atomic mass

    describe how van der Waals forces arise
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    (Original post by Pride)
    answer some of our questions, you'll do fine if you've been revising ok?

    define relative atomic mass

    describe how van der Waals forces arise
    can i answer

    as well?
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    (Original post by otrivine)
    Thanks for telling me i will be aware of that
    ok
    1)How would you carry out a acid-base titration(3)
    2) What colour does methylorange give in acid?
    1) Have a conical flask containing an amount of alkali and add indicator. Then through a burette, introduce some acid with a known concentration until the indicator changes colour. Then work out how much acid required to neutralise. Then using stoichiometry, work out number of moles of alkali.

    2) I don't remember... umm I'd guess at green? or blue? I'll say blue final answer
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    (Original post by Pride)
    answer some of our questions, you'll do fine if you've been revising ok?

    define relative atomic mass

    describe how van der Waals forces arise
    The mean weighted mass of an atom compared to 1/12th of a carbon-12 atom

    Electrons are distributed unevenly in an atom. This creates temporary dipoles. These dipoles then induce dipoles on neighbouring molecules. Weak forces are formed between the two dipoles
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    (Original post by Pride)
    1) Have a conical flask containing an amount of alkali and add indicator. Then through a burette, introduce some acid with a known concentration until the indicator changes colour. Then work out how much acid required to neutralise. Then using stoichiometry, work out number of moles of alkali.

    2) I don't remember... umm I'd guess at green? or blue? I'll say blue final answer
    correct part 1
    second part its red
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    (Original post by otrivine)
    correct part 1
    second part its red
    oh dear, we're meant to know that too?

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Updated: December 6, 2012
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