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ocr f321 f322 questions and answers revision

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  1. Offline

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    (Original post by Natalie21)
    What notes are these?



    They're actually less volatile due to the hydrogen bonds..
    hi can you ask me questions and no they are notthing
  2. Offline

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    (Original post by otrivine)
    hi can you ask me questions and no they are notthing
    On what?
  3. Offline

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    (Original post by Natalie21)
    On what?
    on chem unit 1 cause the exam is in 2 weeks so scary how are you ?by the way
  4. Offline

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    (Original post by otrivine)
    on chem unit 1 cause the exam is in 2 weeks so scary how are you ?by the way
    I'm fine thanks

    Definition of a mole
  5. Offline

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    (Original post by Natalie21)
    What notes are these?



    They're actually less volatile due to the hydrogen bonds..
    Yeah...uhm...that was a uhm...trick question :rolleyes:
  6. Offline

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    (Original post by PrincessMedic)
    Yeah...uhm...that was a uhm...trick question :rolleyes:
    hi shall we ask each other questions
  7. Offline

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    (Original post by otrivine)
    hi shall we ask each other questions
    Yeah sure Only unit 1 though, please
  8. Offline

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    (Original post by PrincessMedic)
    Yeah...uhm...that was a uhm...trick question :rolleyes:
    That's what I thought

    (Original post by otrivine)
    hi shall we ask each other questions
    (Original post by PrincessMedic)
    Yeah sure Only unit 1 though, please
    Sure
  9. Offline

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    (Original post by Natalie21)
    I'm fine thanks

    Definition of a mole
    amount of substance containing many particles as there are carbon atoms in exactly 12g of a carbon-12 atom
  10. Offline

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    (Original post by otrivine)
    amount of substance containing many particles as there are carbon atoms in exactly 12g of a carbon-12 atom
    better wording would be "in exactly 12g of carbon-12 atoms" - otherwise doesn't really make sense :P

    correct a.k.a avagadro's constant
  11. Offline

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    (Original post by otrivine)
    amount of substance containing many particles as there are carbon atoms in exactly 12g of a carbon-12 atom
    6.02*10^23 of a molecule, always add the number or avagardo's constant
  12. Offline

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    (Original post by Natalie21)
    better wording would be "in exactly 12g of carbon-12 atoms" - otherwise doesn't really make sense :P

    correct a.k.a avagadro's constant
    thanks more
  13. Offline

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    (Original post by Rainingshame)
    6.02*10^23 of a molecule, always add the number or avagardo's constant
    thanks can u ask me now?
  14. Offline

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    (Original post by otrivine)
    thanks more
    your turn...
  15. Offline

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    (Original post by Natalie21)
    your turn...
    state one use of NaF
  16. Offline

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    (Original post by otrivine)
    thanks can u ask me now?
    Define a mole.
    As a bonus define relative atomic mass. 3 Marks
    I did unit 1 in Jan (78/90 A ) so here's a unit 2 question:
    Write the balanced structural equation for the complete oxidation of propan-1-ol using [O] to represent the oxidising reagent. What is the name of the oxidising reagent and the catalyst used?
  17. Offline

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    (Original post by Rainingshame)
    Define a mole.
    As a bonus define relative atomic mass. 3 Marks
    I did unit 1 in Jan (78/90 A ) so here's a unit 2 question:
    Write the balanced structural equation for the complete oxidation of propan-1-ol using [O] to represent the oxidising reagent. What is the name of the oxidising reagent and the catalyst used?
    me too i did the jan paper for chem but got a B 65/90
    well done

    -is the weighted mean mass of an atom of an element compared with 1/12th of the mass of carbon-12 atom .
    - ch3ch2oh + 2(O) to give ch3ch2cooh
  18. Offline

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    (Original post by otrivine)
    me too i did the jan paper for chem but got a B 65/90
    well done

    -is the weighted mean mass of an atom of an element compared with 1/12th of the mass of carbon-12 atom .
    - ch3ch2oh + 2(O) to give ch3ch2cooh
    You missed off the +2H2o at the end, that's 2 marks lost. And also you forgot the second part it's acidified potassium dichromate. The catalyst is h2SO4.
    got a question on unit 2 for me?
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    Explain the trends in ionisation energy and atomic radius across a period. (3 marks)
  20. Offline

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    (Original post by otrivine)
    state one use of NaF
    No idea - never learnt this.

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