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

    7
    ReputationRep:
    Name:  ImageUploadedByStudent Room1460594924.075822.jpg
Views: 172
Size:  185.8 KB

    How would I know that ethanol is produced by a batch culture and not a continuous culture?


    Posted from TSR Mobile
    Offline

    9
    ReputationRep:
    You wouldn't, as industrial grade ethanol probably undergoes some refinement/alterations after it was originally produced.
    • Thread Starter
    Offline

    7
    ReputationRep:
    (Original post by zombiejon)
    You wouldn't, as industrial grade ethanol probably undergoes some refinement/alterations after it was originally produced.
    So I don't get it- is it produced by batch or continuous?


    Posted from TSR Mobile
    • Study Helper
    Offline

    17
    ReputationRep:
    Study Helper
    (Original post by Lilly1234567890)
    Name:  ImageUploadedByStudent Room1460594924.075822.jpg
Views: 172
Size:  185.8 KB

    How would I know that ethanol is produced by a batch culture and not a continuous culture?


    Posted from TSR Mobile
    Whether or not the ethanol is produced using a batch or continuous culture is irrelevant for this question. The question doesn't specify it, so you don't need to know it.

    The question just asks for the advantages and disadvantages of using yeast to make ethanol. It's given you some clues on how to answer this by telling you the requirements for the chemical process (steam, temperature, ethene). Think about the cost of this, which process will be cheaper, time consuming, requires more processing (ethene needs to be derived from oil). Some disadvantages you could write about using yeast are that it needs to be maintained properly (correct temperature/pH/nutrient availability) and it won't give you as good a yield as the chemical method.
    Offline

    10
    ReputationRep:
    Ethene is non renewable whilst glucose is which is what is used for fermentation.
    • Thread Starter
    Offline

    7
    ReputationRep:
    (Original post by Eloades11)
    Whether or not the ethanol is produced using a batch or continuous culture is irrelevant for this question. The question doesn't specify it, so you don't need to know it.

    The question just asks for the advantages and disadvantages of using yeast to make ethanol. It's given you some clues on how to answer this by telling you the requirements for the chemical process (steam, temperature, ethene). Think about the cost of this, which process will be cheaper, time consuming, requires more processing (ethene needs to be derived from oil). Some disadvantages you could write about using yeast are that it needs to be maintained properly (correct temperature/pH/nutrient availability) and it won't give you as good a yield as the chemical method.
    Yeah but in the mark scheme
    One of te marking points was to say that ethanol is produced via a batch culture and so I was wondering how could they possibly tell that


    Posted from TSR Mobile
    • Study Helper
    Offline

    17
    ReputationRep:
    Study Helper
    (Original post by Lilly1234567890)
    Yeah but in the mark scheme
    One of te marking points was to say that ethanol is produced via a batch culture and so I was wondering how could they possibly tell that


    Posted from TSR Mobile
    That's strange because that has nothing to do with the benefits or disadvantages of using yeast. It must be referring to the differences since the chemical method doesn't use batch culture or any type of culture for that matter. Have you covered continuous cultures during your studies? If the specification only covers batch cultures, that might explain why it's in the mark scheme.
    • Thread Starter
    Offline

    7
    ReputationRep:
    (Original post by Eloades11)
    That's strange because that has nothing to do with the benefits or disadvantages of using yeast. It must be referring to the differences since the chemical method doesn't use batch culture or any type of culture for that matter. Have you covered continuous cultures during your studies? If the specification only covers batch cultures, that might explain why it's in the mark scheme.
    Yeah we have done continuous culture. Ugh these questions always trip u up and u don't know what to write in exams - it's so annoying !!


    Posted from TSR Mobile
    • Study Helper
    Offline

    17
    ReputationRep:
    Study Helper
    (Original post by Lilly1234567890)
    Yeah we have done continuous culture. Ugh these questions always trip u up and u don't know what to write in exams - it's so annoying !!


    Posted from TSR Mobile
    They like catching you out, that's what exam boards do

    My best guess would be to ask your teacher or have a look at the examiner report for this paper and see how exactly they wanted you to include that in your answer. I expect the question wasn't worth many marks, and that you could have gotten all the marks without putting down "batch culture". But even so, it's best to learn how they expect you to approach each question.

    If you do find out how they expect you to put "batch culture" in the answer, please let me know too
 
 
 
  • 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
    Brussels sprouts
  • 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

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