Results are out! Find what you need...fast. Get quick advice or join the chat
Hey there Sign in to join this conversationNew here? Join for free

Organic chemistry

Announcements Posted on
    • Thread Starter
    • 0 followers
    Offline

    ReputationRep:
    hey,

    quick question:

    what do the cracking and reforming of alkanes produce?

    thanks
    • 11 followers
    Offline

    ReputationRep:
    Let's hear what you think first of all. Clue is in the name.
    • Thread Starter
    • 0 followers
    Offline

    ReputationRep:
    i think it's when alkanes are turned into alkanes/hydrocarbons. i'm not sure what the difference is between cracking and reforming though.
    • 1 follower
    Offline

    ReputationRep:
    Pretty sure it's branched alkanes and cycloalkanes.
    • 29 followers
    Offline

    ReputationRep:
    (Original post by JackG1)
    Pretty sure it's branched alkanes and cycloalkanes.
    That's specifically for catalytic cracking.

    Thermal cracking gives mixtures of products containing high proportions of hydrocarbons with double bonds - alkenes.
    • 0 followers
    Offline

    ReputationRep:
    Reforming is taking an alkane and turning it into a ring type structure. E.g a benzene molecule.
    • 3 followers
    Offline

    ReputationRep:
    Cracking is used to turn long chain hydrocarbons into more useful short chain HC's by breaking the chain. As a consequence of this, unsaturation is introduced, hence Alkene products formed.
    Process is driven by a favorable change in entropy, hence the higher temperatures used.
    • 0 followers
    Offline

    ReputationRep:
    Cracking is exactly what it says.

    Reforming is for example when you take a chain and give it a circle ish structure (I.e. aromatic ring or something of the sort). Do stuff to it to give it a higher octane number bro.

    In context of AS Chemistry, techniques like these are used to improve the usability of the fuel, for example, increasing the octane number, increasing volatility, decreasing activation energy. Thing like that.
    • Thread Starter
    • 0 followers
    Offline

    ReputationRep:
    ohh i get it!!! thanks guys!

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: April 6, 2012
New on TSR

What do you think of the BBC?

UK Parliament wants to hear your views

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