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

OCR 21st Century Science C4 C5 C6 14th June 2016 Discussion thread Watch

    Offline

    3
    ReputationRep:
    I reckon endo and exothermic reactions or titration as 6 markers for c6
    Offline

    0
    ReputationRep:
    (Original post by Char4ncubex)
    Here's my take on it....

    Basically electrolysis is used to separate ionic compounds that cannot be separated by carbon as they are more reactive than carbon, for example aluminium (Al3O2). Electrolysis used electricity to chemically decompose the ionic compound to get the pure form eg to separate the aluminium from the oxygen as we want to use aluminium. The aluminium (called the electrolyte) needs to be molten so that the ions are a free to move and can complete the circuit. The aluminium ions are positively charged and move to the negative electrode called the cathode. Here the aluminium ions gain electrons to become neutral aluminium atoms. Whereas at the positive electrode (the anode) negatively charged oxygen ions move here and lose electrons to become neutral and oxygen atoms. The aluminium is pure and is now separated from the oxygen.Aluminium is in group 3 so it has a 3+ charge, therefore it needs 3 electrons to become neutral.Oxygen has a -2 charge so needs to lose 2 electrons to become neutral. Don't forget that oxygen is a diatomic molecule so at the end you'll need to write O + O = O2.

    I hope I explained alright and it helps
    Thankyou this is very helpful.
    what are your predictions for the 6 mark questions ?
    Offline

    1
    ReputationRep:
    What is c5 even about?
    Offline

    0
    ReputationRep:
    (Original post by Billy.b)
    What is c5 even about?
    Recycling metals, melting points, hydrospheres and lithoshperes, bondings, testing for sulfates/carbonates... such fun.
    Offline

    1
    ReputationRep:
    (Original post by zo26blue)
    Recycling metals, melting points, hydrospheres and lithoshperes, bondings, testing for sulfates/carbonates... such fun.
    thank you!! and tell me about it:unimpressed:
    Offline

    1
    ReputationRep:
    Can someone help me wih the last point of c5 in specification where it talks about the impacts of metal use and production and stuff


    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    (Original post by shanz123)
    Can someone help me wih the last point of c5 in specification where it talks about the impacts of metal use and production and stuff


    Posted from TSR Mobile
    I'm assuming that's about the effect of mining ores on the environment? You could talk about the benefits of jobs/transport/useful metal products made however there are negative impacts e.g. high energy use/toxic fumes when extracting metals/ landscape and habitat destruction/ mine shafts can be dangerous.
    This is very brief but hope it helps
    Offline

    14
    ReputationRep:
    (Original post by HateOCR)
    haha my school made me do chemistry and physics last year (im doing my biology triple this year). So happy the stress is gone however i wont lie the 2015 paper was much harder than the 2016 ones
    So when did you do core?
    Offline

    14
    ReputationRep:
    (Original post by MezmorisedPotato)
    Discuss predictions and tips here.
    I will post resources later.
    Good luck
    When are you posting the resources?
    Offline

    1
    ReputationRep:
    Guys! I'm so worried! I don't know much about chemistry I revised so much but I just forget it
    Offline

    15
    ReputationRep:
    My personal predictions are

    C4 - Mendeleev,Newlands and Dobereiner or Ions
    C5 - Different types of bonds so ionic, metallic and covalent - sim and differences or Electrolysis
    C6 - Rates of reaction or Titrations
    • TSR Support Team
    • Clearing and Applications Advisor
    Offline

    21
    ReputationRep:
    (Original post by Wisdom2)
    My personal predictions are

    C4 - Mendeleev,Newlands and Dobereiner or Ions
    C5 - Different types of bonds so ionic, metallic and covalent - sim and differences or Electrolysis
    C6 - Rates of reaction or Titrations
    Oh goddddd
    Those C6 predictions are my absolute worst nightmare! If titrations come up I will honestly hit my head on the desk

    Can't we just have a nice one on diamond vs graphite for C5
    Offline

    17
    ReputationRep:
    (Original post by Wisdom2)
    My personal predictions are

    C4 - Mendeleev,Newlands and Dobereiner or Ions
    C5 - Different types of bonds so ionic, metallic and covalent - sim and differences or Electrolysis
    C6 - Rates of reaction or Titrations
    Nice predictions! What do you mean by "sim and differences or Electrolysis" ??
    Offline

    17
    ReputationRep:
    (Original post by NiamhM1801)
    Oh goddddd
    Those C6 predictions are my absolute worst nightmare! If titrations come up I will honestly hit my head on the desk

    Can't we just have a nice one on diamond vs graphite for C5
    Ahah I love rates of reactions. But yeah for C5 if graphite/diamond came up I would loooove that! :elmo: I really hate those mathsy ones uh and i hate testing for ions too
    • TSR Support Team
    • Clearing and Applications Advisor
    Offline

    21
    ReputationRep:
    (Original post by Ella_08)
    Nice predictions! What do you mean by "sim and differences or Electrolysis" ??
    Think he meant similarities and differences between ionic, metallic and covalent bonds
    • TSR Support Team
    • Clearing and Applications Advisor
    Offline

    21
    ReputationRep:
    (Original post by Ella_08)
    Ahah I love rates of reactions. But yeah for C5 if graphite/diamond came up I would loooove that! :elmo: I really hate those mathsy ones uh and i hate testing for ions too
    Hm I guess rate of reaction isn't that bad, it's titrations that really get to me. Same haha, although I don't mind mathsy ones too much. Oh god testing for ions would be dreadful too!
    I feel like the only thing I'm prepared for for this exam is C4 lmao
    Offline

    15
    ReputationRep:
    (Original post by NiamhM1801)
    Think he meant similarities and differences between ionic, metallic and covalent bonds
    Yup!
    • Thread Starter
    Offline

    15
    ReputationRep:
    (Original post by Steampunk_Turtle)
    When are you posting the resources?
    Adding now
    Offline

    17
    ReputationRep:
    (Original post by NiamhM1801)
    Think he meant similarities and differences between ionic, metallic and covalent bonds
    (Original post by NiamhM1801)
    Hm I guess rate of reaction isn't that bad, it's titrations that really get to me. Same haha, although I don't mind mathsy ones too much. Oh god testing for ions would be dreadful too!
    I feel like the only thing I'm prepared for for this exam is C4 lmao
    oh right, i thought he made a typo and meant 'sim/diff of electrolysis, my bad Uh tell me about it, i hate titrations. I'm cramming everything now, havent even got to that lool. At least you feel confident about some of it, the only stuff i like is the environment, graphite/diamond and history of periodic table. I'm screwed with C456 basically but i did well on C123 so it should be ok :dontknow: good luck to you
    Offline

    17
    ReputationRep:
    (Original post by Ben ESC)
    I reckon endo and exothermic reactions or titration as 6 markers for c6
    Let's hope it's endo/exothermic reactions :yeah:
 
 
 
  • 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
    Are unpaid trial work shifts fair?
  • 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.