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

    2
    ReputationRep:
    (Original post by BrokenS0ulz)
    OCR use the amino-X way of naming for amines, I'd stick to that.
    Okay thanks
    Also,
    Jan 11 3b
    C3H7NH2
    Answer: propylamine/1-aminopropane do not allow: aminopropane
    I'm not sure why aminopropane would be wrong?
    Offline

    2
    ReputationRep:
    (Original post by Welbeck)
    June 12 4g- I don't get how you do the first step. The mark scheme says:
    If 0.6625g of Na2CO3 is made into a 1dm^3 solution (and Mr is 106) then why is the conc (0.6625/106)moldm^3

    Anyone explain/?
    I went ahead by doing n=m/mr 0.6225/106
    To work out the number of moles of Na2CO3
    Because they gave you the mass of NA2CO3 and you have mr you use the other formula
    Offline

    3
    ReputationRep:
    (Original post by MathsAddict)
    I went ahead by doing n=m/mr 0.6225/106
    To work out the number of moles of Na2CO3
    Because they gave you the mass of NA2CO3 and you have mr you use the other formula
    Ohh, I get it now, just sounded a bit confusing. Thanks
    Offline

    2
    ReputationRep:
    (Original post by tealover96)
    Okay thanks
    Also,
    Jan 11 3b
    C3H7NH2
    Answer: propylamine/1-aminopropane do not allow: aminopropane
    I'm not sure why aminopropane would be wrong?
    The amine is on the first carbon so you had to specify the 1-aminopropane. or go ahead by doing by using the direct name propylamine
    Offline

    2
    ReputationRep:
    (Original post by tealover96)
    Okay thanks
    Also,
    Jan 11 3b
    C3H7NH2
    Answer: propylamine/1-aminopropane do not allow: aminopropane
    I'm not sure why aminopropane would be wrong?
    I think it's because it could be 1-aminopropane or2-aminopropane, so you need to specify which one it is
    Offline

    2
    ReputationRep:
    (Original post by Welbeck)
    Ohh, I get it now, just sounded a bit confusing. Thanks
    no problem
    Offline

    2
    ReputationRep:
    (Original post by MathsAddict)
    Life saver just saved me having to write it up my self XD. Thanks a lot man.
    How can I see them I can't find the original post!
    Offline

    2
    ReputationRep:
    (Original post by MathsAddict)
    The amine is on the first carbon so you had to specify the 1-aminopropane. or go ahead by doing by using the direct name propylamine
    (Original post by BrokenS0ulz)
    I think it's because it could be 1-aminopropane or2-aminopropane, so you need to specify which one it is

    Thanks!
    I assumed that 1s didn't have to be written for some reason
    Offline

    2
    ReputationRep:
    (Original post by KittenMittens)
    How can I see them I can't find the original post!
    it was on the last page its not my notes btw credits to the person
    Attached Files
  1. File Type: docx Chem A2 -edited.docx (26.8 KB, 100 views)
    Offline

    2
    ReputationRep:
    we dont need to know how to name complexes..
    Offline

    2
    ReputationRep:
    (Original post by nats927)
    we dont need to know how to name complexes..
    Yes you do need to know how to name them it is in the spec and revise book
    Offline

    2
    ReputationRep:
    ask me if im ready
    i wish i never had 3 exams in a row, need more time ffs
    Offline

    2
    ReputationRep:
    (Original post by MathsAddict)
    Yes you do need to know how to name them it is in the spec and revise book
    my teacher said we didnt, but i looked.. oh crap. reckon i can learn it all by tomorrow?
    Offline

    2
    ReputationRep:
    (Original post by MathsAddict)
    it was on the last page its not my notes btw credits to the person
    Thanks!
    Offline

    3
    ReputationRep:
    (Original post by Anonymous696061)
    LOL, same here -just looked around 5mins into the exam to see wtf looks on everyone's face..:eek4:...;P

    Anyways, I'm sorry to you & everyone else using my notes, cos there was a minor error about E cells that I made; here's the revised version! (-Couldn't edit original attachment for some reason so deleted that post:P)
    I was just about to post that cos the metal with the more electronegative electrode potential is a reducing agent
    Offline

    2
    ReputationRep:
    Guys I have a question. How do you know if a molecule with an oxygen in its structure will form hydrogen bonds or permanent dipole - permanent dipole? Or both? Thanks
    Offline

    2
    ReputationRep:
    (Original post by nats927)
    my teacher said we didnt, but i looked.. oh crap. reckon i can learn it all by tomorrow?
    it will take 10 mins to learn its really easy just know the simple rules on revise book page 32-33.
    Offline

    2
    ReputationRep:
    (Original post by KittenMittens)
    Guys I have a question. How do you know if a molecule with an oxygen in its structure will form hydrogen bonds or permanent dipole - permanent dipole? Or both? Thanks
    The three molecules that can form hydrogen bonds are FON or fone .
    Flourine , Oxygen and Nitrogen, if these are present just focus on hydrogen bonding if it other electronegative molecules like Cl or Br etc then it is permanent due to the large difference in electronegativity value.
    Offline

    2
    ReputationRep:
    (Original post by KittenMittens)
    Guys I have a question. How do you know if a molecule with an oxygen in its structure will form hydrogen bonds or permanent dipole - permanent dipole? Or both? Thanks
    pd-pd when theres a polar bond ie c-cl cl is more electronegative so pulls electrons towards it becoming the delta negative
    but if theres H connected to either O,F,N bond then its hydrogen ie O-H
    Offline

    2
    ReputationRep:
    (Original post by MathsAddict)
    it will take 10 mins to learn its really easy just know the simple rules on revise book page 32-33.
    thank you for letting me know i was literally going to skip past it.
    do you reckon if i just revise from salters book i can get a good grade?
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Has a teacher ever helped you cheat?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • 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.