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B (Salters) F331 (Chemistry for Life) 22nd May 2015 [Official Thread] watch

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    (Original post by dgreen311)
    Would they except c4h9oh for the butan2ol
    Nope


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    (Original post by vuvuzela)
    They are in the same group [1 marking point]
    So react in a similar way [2nd marking point]

    1 mark, but both statements have to be said. Salters.....

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    Would I still get the 2 marks if i said:
    -they're in the same group
    -so they have similar properties
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    I think 50

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    (Original post by shooting_stars)
    Would I still get the 2 marks if i said:
    -they're in the same group
    -so they have similar properties
    Would i grt 2 marks for

    Same group
    So same chemical behaviours

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    Can someone just like post the unofficial mark scheme


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    Talks over, unofficial mark scheme time


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    (Original post by Supergirlxxxxxx)
    Nope


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    Yes he would. Atom order doesn't matter.
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    Can anyone tell me how many marks I've lost by putting the predicted bond angle as 120 degrees and stating that there are 3 areas of electron density around the central carbon atoms?
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    Hopefully we all do good. If there's an unofficial mark scheme out letcha boy know !
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    (Original post by HecTic_H)
    If someone orders the questions, I'll make an unofficial mark scheme.
    ^
    Q1. protons neutrons electrons of Si
    TOFMS
    KE
    RAM
    Half-life
    Double beta decay of Germanium
    Protons/neutrons/electrons charge/mass
    electronic structure of germanium
    what period and group tells us

    Q2?. ...
    Enthalpy change of decomposition of H2O2 = -196 kJMol^-1
    Formation of water equation
    ?
    Volume of products = 277/288/289?
    Why is H2O2 > Kerosene in efficiency?

    Q3.
    How is an oxide of nitrogen made in exhaust fumes?



    If someone orders the questions like that for the rest because I don't remember, I'll put the answers for the questions. I forgot the questions themselves but have done most.
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    (Original post by HecTic_H)
    ^
    Q1. protons neutrons electrons of Si
    TOFMS
    KE
    RAM
    Half-life
    Double beta decay of Germanium
    Protons/neutrons/electrons charge/mass
    electronic structure of germanium
    what period and group tells us

    Q2?. ...
    Enthalpy change of decomposition of H2O2 = -196 kJMol^-1
    Formation of water equation
    ?
    Volume of products = 277/288/289?
    Why is H2O2 > Kerosene in efficiency?

    Q3.
    How is an oxide of nitrogen made in exhaust fumes?



    If someone orders the questions like that for the rest because I don't remember, I'll put the answers for the questions. I forgot the questions themselves but have done most.
    I don't think it was anything to do with kerosene efficiency. The question was merely to state an advantage of h202 over kerosene.
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    (Original post by Jam3898)
    Yes he would. Atom order doesn't matter.
    Actually ignore this. You never know with Salters. They will probably reject it.
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    (Original post by -Gifted-)
    I don't think it was anything to do with kerosene efficiency. The question was merely to state an advantage of h202 over kerosene.
    Okay thanks, can you remember any other questions?
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    I have some F332 revision questions about catalysis to help https://www.dropbox.com/s/hthpwjmgc6...tions.pdf?dl=0.
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    (Original post by HecTic_H)
    Okay thanks, can you remember any other questions?
    3 stages in between vaporisation and detection.
    what 2 variables are kept constant in the thermal decomposition of strontium and calcium
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    (Original post by -Gifted-)
    3 stages in between vaporisation and detection.
    what 2 variables are kept constant in the thermal decomposition of strontium and calcium
    I put the three stages as 2. Ionisation 3. Acceleration and 4. Travel through vacuum. Not sure about the third.

    I put the variables as 1. The mass of each compound and 2. The temperature increase. not sure on the second one though
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    So many silly mistakes made. You're welcome guys, I lowered the boundaries for sure lmao
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    (Original post by misteltain)
    So many silly mistakes made. You're welcome guys, I lowered the boundaries for sure lmao
    I made 1 definite silly mistake and it was accidently doing a covalent dot and cross diagram instead of ionic
    What mistakes have you made?
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    (Original post by Adam971)
    What was the definition for bond enthalpy? I put 'the energy required to break one mole of bonds in a molecule'
    The energy required to break a bond in one mole of a gaseous compound and they are averages because they are for gaseous molecules and this may not be their standard States? Think I'm wrong though
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    Some other questions in the exam:
    Significance of a wedge
    Why Mendeleev left gaps for yet-to-be discovered elements?
    Explain bond enthalpy and why it is an average?
 
 
 
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