Results are out! Find what you need...fast. Get quick advice or join the chat
Hey! Sign in to get help with your study questionsNew here? Join for free to post

Ethene Structure

Announcements Posted on
    • Thread Starter
    • 4 followers
    Offline

    ReputationRep:
    I'm confused about the structure of ethene.

    On an AQA mark sheme ethene's structure is exactly like the following:
    http://www.bbc.co.uk/scotland/learni...ges/ethene.gif

    However in a CGP revision guide ethene's structure is like the following:
    http://0.tqn.com/d/chemistry/1/0/L/G/1/ethylene.jpg

    I'm not so sure about which one is the right one. In the question paper for the mark scheme I drew the ethene structure which is on the CGP guide. However the AQA mark scheme structure is slightly different due to the position of the 4 Hydrogen atoms.

    My question is which structure is the correct true structure of ethene?
    • 48 followers
    Offline

    ReputationRep:
    They're both just cartoons :yes: Both are fine in terms of structure, just the CGP version more accurately represents the shape (i.e. the bond angles)
    • Thread Starter
    • 4 followers
    Offline

    ReputationRep:
    (Original post by EierVonSatan)
    They're both just cartoons :yes: Both are fine in terms of structure, just the CGP version more accurately represents the shape (i.e. the bond angles)
    Thanks for helping me. I was confused on whether I should give myself the mark for the question or not.
    • 0 followers
    Offline

    ReputationRep:
    Well technically the CGP revision guide is correct as the carbon atoms have 3 areas of electron densities so it's a trigonal planar shape with the bond angle being 120 degrees. However when they ask you to draw the structure then probably both are correct if that's what it says in the mark scheme.
    • 32 followers
    Offline

    ReputationRep:
    (Original post by krisshP)
    I'm confused about the structure of ethene.

    On an AQA mark sheme ethene's structure is exactly like the following:
    http://www.bbc.co.uk/scotland/learni...ges/ethene.gif

    However in a CGP revision guide ethene's structure is like the following:
    http://0.tqn.com/d/chemistry/1/0/L/G/1/ethylene.jpg

    I'm not so sure about which one is the right one. In the question paper for the mark scheme I drew the ethene structure which is on the CGP guide. However the AQA mark scheme structure is slightly different due to the position of the 4 Hydrogen atoms.

    My question is which structure is the correct true structure of ethene?
    Well I think it depends as to whether you should give yourself the mark; if you're doing GCSEs (or equivalent), give yourself the mark, however if you're doing A levels (or equivalent), don't give yourself the mark.

    If you haven't yet learned about bond angles, give yourself the mark
    • 48 followers
    Offline

    ReputationRep:
    (Original post by thegodofgod)
    Well I think it depends as to whether you should give yourself the mark; if you're doing GCSEs (or equivalent), give yourself the mark, however if you're doing A levels (or equivalent), don't give yourself the mark.

    If you haven't yet learned about bond angles, give yourself the mark
    So if a question asked you to draw ethane and you drew...



    you shouldn't get the mark? :mmm:
    • 32 followers
    Offline

    ReputationRep:
    (Original post by EierVonSatan)
    So if a question asked you to draw ethane and you drew...



    you shouldn't get the mark? :mmm:
    I think it would depend on the context of the question then - if the question's about bond angles, you should really draw the shape with the wedged / dotted lines.

    I remember a question about drawing the structures (showing bond angles) of two optical isomers back in Unit 4 (A2), and they only gave the mark if you drew the wedged / dotted lines + showed the mirror line.
    • 48 followers
    Offline

    ReputationRep:
    (Original post by thegodofgod)
    I think it would depend on the context of the question then - if the question's about bond angles, you should really draw the shape with the wedged / dotted lines.

    I remember a question about drawing the structures (showing bond angles) of two optical isomers back in Unit 4 (A2), and they only gave the mark if you drew the wedged / dotted lines + showed the mirror line.
    Indeed, context is key :yes:
    • 32 followers
    Offline

    ReputationRep:
    (Original post by EierVonSatan)
    Indeed, context is key :yes:
    But I think if they specifically stated to draw the displayed formula of ethene, you should get the mark for



    • 0 followers
    Offline

    ReputationRep:
    They are both correct

    Another way of drawing ethene is the skeletal structure below;

    =
    • Thread Starter
    • 4 followers
    Offline

    ReputationRep:
    Thanks
    • 0 followers
    Offline

    ReputationRep:
    The first picture shows ethene ready for electrophilic attack


    This was posted from The Student Room's iPhone/iPad App

Reply

Submit reply

Register

Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. By joining you agree to our Ts and Cs, privacy policy and site rules

  2. Slide to join now Processing…

Updated: June 8, 2012
New on TSR

GCSE mocks revision

Talk study tips this weekend

Article updates
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.