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Chemistry c2 unit 2 aqa monday gcse 20th new spec Watch

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    Making Soluble Salts
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    Electrolysis
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    Rates of Reaction
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    Properties of ionic compounds
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    Other
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    Would I get a mark for the ' state the type of heat transfer' question if i just put: heat

    Also, for the question ' would heat be needed again when the reaction takes place', my answer was: when the reaction took place the first time, heat was given to it already and so in the reverse direction heat isn't needed

    cheers
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    Would I still get the mark for calling Carbon Dioxide a 'simple substance'? I totally forgot about simple molecule/simple covalent structure but I knew it was simple substance, I included every other point I just hope I get the mark for that
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    (Original post by denizcan619)
    Would I get a mark for the ' state the type of heat transfer' question if i just put: heat

    Also, for the question ' would heat be needed again when the reaction takes place', my answer was: when the reaction took place the first time, heat was given to it already and so in the reverse direction heat isn't needed

    cheers
    Potentially as it was the second question and I fear everyone has over complicated it. And unlikely, as it isn't really about the heat but activation energy etc, possibly, but you'd be lucky.


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    (Original post by examphobia)
    Would I still get the mark for calling Carbon Dioxide a 'simple substance'? I totally forgot about simple molecule/simple covalent structure but I knew it was simple substance, I included every other point I just hope I get the mark for that
    I have to admit I doubt it, molecule will probably be a key word I'm afraid.


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    (Original post by sammann123)
    It was why didn't the cake need to be heated, the answer being it is an exothermic reaction and has low activation energy so doesn't require much energy (from heating) to start.
    Nope, the reaction was reversible. It took in heat, and so did not need to be heated. What you said about a low activation energy has no relevance at all :rolleyes:
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    (Original post by lolface32)
    Nope, the reaction was reversible. It took in heat, and so did not need to be heated. What you said about a low activation energy has no relevance at all :rolleyes:
    In the actual exam I talked about how it was an endothermic reaction when decomposing the hydrogen carbonate and therefore did need heating, however as forming the hydrogen carbonate was exothermic it only needed a small amount of energy to take place, I.e not heating is needed..? Is that not right then? All reactions surely need some energy to take place even if it is a reversible reaction, so there is always a activation energy, just in this case it was very low so therefore heating was not needed?


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    (Original post by sammann123)
    In the actual exam I talked about how it was an endothermic reaction when decomposing the hydrogen carbonate and therefore did need heating, however as forming the hydrogen carbonate was exothermic it only needed a small amount of energy to take place, I.e not heating is needed..? Is that not right then? All reactions surely need some energy to take place even if it is a reversible reaction, so there is always a activation energy, just in this case it was very low so therefore heating was not needed?


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    Hahahaha, honestly at this point I am genuinely confused. Forgot what the question was
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    (Original post by lolface32)
    Hahahaha, honestly at this point I am genuinely confused. Forgot what the question was
    Ahah fair enough, I think the answer was to do with the fact it needed lots of energy to go one way, but not as much to go the other way.
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    Does anyone have an idea about the grade boundaries?:confused:
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    (Original post by kam123456)
    2 (a) (ii) How does a hydrogen ion change into a hydrogen atom?
    2 (c) (i) Which ion makes the waste alkaline?
    4 (c) (ii) What information does the molecular ion peak give about the molecule?
    5 (c) (ii) Sodium iodide contains sodium ions (Na+) and iodide ions (I

    ).
    Describe, as fully as you can, what happens when sodium atoms react with iodine atoms
    to produce sodium iodide.
    5 (c) (v) What is formed at the negative electrode when sodium iodide solution is electrolysed?



    Can you answer these question for me please from the 2013 exam.
    This is worrying, I don't remember anything about ionic bonding on this paper


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    Can anyone post the unofficial mark scheme pls? that would be very useful .. thanx
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    (Original post by 09spoudyal)
    Can anyone post the unofficial mark scheme pls? that would be very useful .. thanx
    Why don't u do it urself?


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    (Original post by Elm Tree)
    I wrote that too :woo:
    Yeah, we were supposed to write about how it was
    1. a simple molecular structure
    2. The intermolecular forces between the molecules are weak
    3. Which means it takes a small amount of energy to overcome them.
 
 
 
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