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    (Original post by Rahatara Sadique)
    What was the answer to the question where it was asked to suggest why helium is suitable to use in the mass spectrometer?

    And also, the answer to the catalyst question...why isn't a battery needed once the catalyst is heated up?
    adsorption and desorption of the gases also leads to more heat energy due to the catalyst surface
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    (Original post by Yara El-Bardisi)
    it wasn't 75! it was 100, you had to find the moles of the H2 by dividing the volume by 24 and then using the ratio of moles and the 24 dm3 to find the volume of the HCL
    EXACTLY

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    (Original post by Sandy_Vega30)
    Mg has fewer protons than Al hence Mg has weaker metallic bonds than Al. This means Mg requires less energy to break these points hence has a lower melting point.
    **** I wrote mg has filled subshell

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    (Original post by Saad69)
    **** I wrote mg has filled subshell

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    I thought of that too at first but the question is asking for effect on melting temperature not ionization energies.
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    (Original post by anujsr)
    adsorption and desorption of the gases also leads to more heat energy due to the catalyst surface
    I wrote that the battery provides the suitable temperature for the catalyst to start functioning. Once this temperature is achieved, catalyst can speed up the rate of reaction so battery will not be required.

    Idk if this answer even makes sense...
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    (Original post by Rahatara Sadique)
    I wrote that the battery provides the suitable temperature for the catalyst to start functioning. Once this temperature is achieved, catalyst can speed up the rate of reaction so battery will not be required.

    Idk if this answer even makes sense...
    It would get 1 mark. Although depends upon the examiner. According to me you only gave 1 marking point
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    Hey wat do u guys think grade boundary for an A will be?????
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    I think its because the reaction was exothermic so when reaction is initiated the reaction will provide heat for itself

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    (Original post by jannz)
    Hey wat do u guys think grade boundary for an A will be?????
    Probably 68. It wasn't a hard paper.
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    (Original post by Willandy123)
    I think its because the reaction was exothermic so when reaction is initiated the reaction will provide heat for itself

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    That's exactly what I wrote!
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    (Original post by Sandy_Vega30)
    Ethane and propane are used to make ethene and propene by dehydrogenation reaction. This ethene and propene is used to make poly ethene and poly propene. But since, Ethane and Propane are required for the manufacture of Shane gas, the production of poly ethene and poly propene decreases.
    doesnt the gas deposit exist naturally?
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    gases react in simple ratios of their volume
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    For the catalyst question can we write that heating it provides the activation energy needed to initiate the reaction?

    And for the helium question is it wrong if i mentioned it is less dense?
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    For the drawing of the line to show deflection question - I drew it above but wrote specifically most deflected. Would I still get the mark?
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    Guys!!! What did you get for the enthalpy question???😱
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    (Original post by Becka99)
    For the catalyst question can we write that heating it provides the activation energy needed to initiate the reaction?

    And for the helium question is it wrong if i mentioned it is less dense?
    Well for helium, I mentioned it is less dense and gas at room temperature.
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    (Original post by Willandy123)
    Well for helium, I mentioned it is less dense and gas at room temperature.
    I wrote it is a gas at rtp as well cus then no need of vapourization..hope its correct
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    (Original post by Mimiastc)
    Guys!!! What did you get for the enthalpy question???😱
    -2868.5 kJmol-1
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    (Original post by Becka99)
    For the catalyst question can we write that heating it provides the activation energy needed to initiate the reaction?

    And for the helium question is it wrong if i mentioned it is less dense?
    Oh my god I actually wrote that too about the activation energy. However I think you would also have to mention that it is an exothermic reaction and that's why it doesn't need to be heated for the second mark. I think you are correct about Helium being less dense because that implies that it's deflected the most and can therefore detect any leaks.
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    (Original post by wenogk)
    -2868.5 kJmol-1
    I LOVE YOU 😍 thats what i got
 
 
 
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