Hey there! Sign in to join this conversationNew here? Join for free
    Offline

    12
    ReputationRep:
    (Original post by Alivere)
    I put for the silicon dioxide that there is an extra shell of electrons...I honestly had no idea left it until the end and with 5 mins to go just wrote that :/

    What did people get for the empiracal formula question?h
    But it was only referring to the outer shell electrons.

    We should all devise an unofficial paper for 2013 Jan from our memory of what the questions were.
    Offline

    0
    ReputationRep:
    Just googled it and SiO2 is a giant covalent structure so each silicon would be bonded to two oxygen which each would be bonded to another silicon which would be bonded to another oxygen and so on damnnnnnn
    Offline

    0
    ReputationRep:
    (Original post by EstebanK0)
    But it was only referring to the outer shell electrons.

    We should all devise an unofficial paper for 2013 Jan from our memory of what the questions were.
    Yeah I know I just didn't think giant covalent for any reason dropped that mark definitely

    Yes unofficial paper would be good. I tend to only remember the topics...I know there was:
    Cracking
    Reforming
    Beta Decay
    Mendeleev
    Bond Angles
    Bonding
    Alternative Fuels
    Octane Number
    Bond making/breaking
    Empirical formula
    Energy from a fuel

    That's about it I can remember and in completely the wrong order
    Offline

    0
    ReputationRep:
    First question was about reforming.
    Q1) Explain octane number and why high octane number is desirable.
    What is the product of reforming?
    Explain the terms heterogeneous and catalyst.
    Describe and explain how a catalyst poison works.
    Bond making and bond breaking. Why are the reactions endothermic?
    Offline

    3
    ReputationRep:
    (Original post by Alivere)
    Yeah I know I just didn't think giant covalent for any reason dropped that mark definitely

    Yes unofficial paper would be good. I tend to only remember the topics...I know there was:
    Cracking
    Reforming
    Beta Decay
    Mendeleev
    Bond Angles
    Bonding
    Alternative Fuels
    Octane Number
    Bond making/breaking
    Empirical formula
    Energy from a fuel

    That's about it I can remember and in completely the wrong order
    ~There was also a question about how the periodic table shows the atomic structure or something like that
    Offline

    2
    ReputationRep:
    (Original post by science19)
    hey I have the paper you guys did today for mock tomorrow. If you don't mind can you please tell me on what to revise on. Thank you so much
    What use is that? You're only cheating yourself.
    Offline

    0
    ReputationRep:
    (Original post by Welbeck)
    ~There was also a question about how the periodic table shows the atomic structure or something like that
    Oh yeah! and there was some Beta decay writing equations and there was the balancing of Ge2O3
    Offline

    0
    ReputationRep:
    Unofficial mark scheme anyone?
    Offline

    0
    ReputationRep:
    hey guys quick question ... might sound stupid.... but for the question on type of hydrocarbon produced by the reforming process ... i put arenes ... i didnt know which one to put cycloaklane or arenes .... but i chose arenes at the end ....... do you think it is correct?
    Offline

    0
    ReputationRep:
    (Original post by nksunny)
    hey guys quick question ... might sound stupid.... but for the question on type of hydrocarbon produced by the reforming process ... i put arenes ... i didnt know which one to put cycloaklane or arenes .... but i chose arenes at the end ....... do you think it is correct?
    In reforming only cycloalkanes and hydrogen are formed.. sorry
    Offline

    0
    ReputationRep:
    An unofficial mark scheme is not needed! It will just worry everyone more. Just wait till the 8th for results Hopefully I scraped a B. Because I counted 12 marks I was unsure/knew were wrong..
    Offline

    0
    ReputationRep:
    (Original post by xOsugaplumfairy)
    In reforming only cycloalkanes and hydrogen are formed.. sorry
    darn it ..... surely the cycloalkane is reformed further to arenes .... hmmm
    Offline

    0
    ReputationRep:
    No!not only cycoalkenes and hydrogens are formed arenes are formed two, read the book... they will probably both be right I put arene too
    Offline

    0
    ReputationRep:
    (Original post by Alivere)
    I put for the silicon dioxide that there is an extra shell of electrons...I honestly had no idea left it until the end and with 5 mins to go just wrote that :/

    What did people get for the empiracal formula question?h
    CeO2
    Offline

    0
    ReputationRep:
    (Original post by xOsugaplumfairy)
    An unofficial mark scheme is not needed! It will just worry everyone more. Just wait till the 8th for results Hopefully I scraped a B. Because I counted 12 marks I was unsure/knew were wrong..
    urmm speek for yourself I want an unofficial markscheme, just don't LOOK.
    Offline

    0
    ReputationRep:
    (Original post by Maat)
    CeO2
    I got that too
    Offline

    0
    ReputationRep:
    I totally messed up the bond angles one :'(, that's ike 6 marks gone, do you guys think it will be low or high grade boundaries
    Offline

    0
    ReputationRep:
    bond angles one was 120 and then 120 again?
    Offline

    1
    ReputationRep:
    (Original post by Maat)
    bond angles one was 120 and then 120 again?
    I thought it was 120 and then 109.
    May be wrong though :P

    ALSO: I also thought that cycloalkanes and arenes are products of reforming. I put arenes.
    Offline

    12
    ReputationRep:
    Here's what I did for the bond angle questions.

    Q. What is bond angle and shape for b? Explain your answer (4 marks)

    A. 120 degrees
    Planar Triangular
    3 areas of electron density around central C atom
    Electron repel as far apart from each other to overcome electron repulsion

    Q. Predict the bond angle for a and explain why.

    A. 109 degrees
    Has four areas of electron density
 
 
 
Poll
Do you agree with the PM's proposal to cut tuition fees for some courses?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.