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    Hows everyone with Hess's Law?
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    (Original post by Sheary13)
    Hows everyone with Hess's Law?
    im ok with it, as long as they don't come out with the next random questions it shouldn't be hard, why?
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    Aqa....
    Physics unit 2 resit exam: Solid, unlike any past papers
    Biology unit 2 resit exam: Solid, unlike any past papers
    Anyone want to guess what's going to go down tomorrow?
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    (Original post by Ninjakam119)
    Aqa....
    Physics unit 2 resit exam: Solid, unlike any past papers
    Biology unit 2 resit exam: Solid, unlike any past papers
    Anyone want to guess what's going to go down tomorrow?
    tbf unit 1 was ok but they could end up putting some next question in for unit 2 as long as its not maxwells disitribution im ok
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    what does the 'most probable energy' represent on maxwells distribution
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    They did put some odd questions on CHEM 1 such as the one asking how VDW arise.. I have a feeling they are gonna do exactly the same for this paper
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    (Original post by Jophilip123)
    what does the 'most probable energy' represent on maxwells distribution
    the energy that the majority of particles have, basically
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    Which past paper do people recommend doing ?! Which one is hardest?
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    (Original post by kother2015)
    Which past paper do people recommend doing ?! Which one is hardest?
    More recent ones, I'd say the last two so 2014 and 2015
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    Anyone feel like last year's paper wasn't even that bad and hating themselves for screwing it up?? I am lol
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    (Original post by lahigueraxxx)
    Anyone feel like last year's paper wasn't even that bad and hating themselves for screwing it up?? I am lol
    Me too. Although I didn't have the knowledge base I have this year thanks to revision and CHEM4 and 5 with regards to chemistry so hopefully I wont make the stupid mistakes I did last year. At the moment I'm just expecting the worst and hoping to be plesantly surprised. Oh and I came across an obscure question the other day but since its only come up once I'm thinking it might come up again. Beryllium and aluminium chloride are covalent because the beryllium and aluminium have a high charge density so attract the electrons away from the chlorine (AQA said polarises CL-) making a covalent bond rather than ionic like you'd expect. Just figured I'd mention it since I didn't know that till yesterday and I figured that might mean other people also don't know.
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    the problem with chem 2 is that its easy to make small mistakes i done the june 2015 paper 2 days ago got 76 but lost 10 marks for simple arithmetic errors.
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    Guys when can u put the reversible sign when writing an equation of chlorine and water?
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    (Original post by NuzAsk)
    Guys when can u put the reversible sign when writing an equation of chlorine and water?
    When it says give the equilibrium formed..or along those lines..it was in a past paper not too long ago. If it just says reaction between Chlorine and water, go for the standard.
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    (Original post by ChaoticParadigm)
    Me too. Although I didn't have the knowledge base I have this year thanks to revision and CHEM4 and 5 with regards to chemistry so hopefully I wont make the stupid mistakes I did last year. At the moment I'm just expecting the worst and hoping to be plesantly surprised. Oh and I came across an obscure question the other day but since its only come up once I'm thinking it might come up again. Beryllium and aluminium chloride are covalent because the beryllium and aluminium have a high charge density so attract the electrons away from the chlorine (AQA said polarises CL-) making a covalent bond rather than ionic like you'd expect. Just figured I'd mention it since I didn't know that till yesterday and I figured that might mean other people also don't know.
    Omg thats such a werid questions! Thanks so much ill just learn it since the meaning is strange lolz
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    you'll need to know it for chem 5 anyway

    (Original post by Aliceeee12)
    Omg thats such a werid questions! Thanks so much ill just learn it since the meaning is strange lolz
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    (Original post by man i)
    you'll need to know it for chem 5 anyway
    Aaah im having trouble understanding it U5 rev later hahah
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    So I thought I'd write this question as I wouldn't necessarily know how to do it straight away upon first glance

    ) A 25.0 cm3 sample of 2.00 mol dm–3 hydrochloric acid was mixed with 50.0 cm3 of a1.00 mol dm–3 solution of sodium hydroxide. Both solutions were initially at 18.0 °C.After mixing, the temperature of the final solution was 26.5 °C.Use this information to calculate a value for the standard enthalpy change for thefollowing reaction.HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)In your calculation, assume that the density of the final solution is 1.00 g cm–3 and thatits specific heat capacity is the same as that of water. (Ignore the heat capacity of thecontainer.).................. ................................ .............

    Energy absorbed (q) = Mass of Solution X Heat Capacity X Temperature change

    - You use mass of both solutions combines (each cm cubed is roughly a gram) (25+50= 75)
    - Temp change = 26.5-18 = 8.5

    So 75 x 4.18 X 8.5 = 2665
    you use moles of whatever is not in XS - so the lowest value. In this case, both are 0.05 so that's what we use

    Enthalpy change = Q/No of Moles
    Therefore -2665/0105

    = -53.4 Kjmol-1
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    (Original post by ChaoticParadigm)
    Me too. Although I didn't have the knowledge base I have this year thanks to revision and CHEM4 and 5 with regards to chemistry so hopefully I wont make the stupid mistakes I did last year. At the moment I'm just expecting the worst and hoping to be plesantly surprised. Oh and I came across an obscure question the other day but since its only come up once I'm thinking it might come up again. Beryllium and aluminium chloride are covalent because the beryllium and aluminium have a high charge density so attract the electrons away from the chlorine (AQA said polarises CL-) making a covalent bond rather than ionic like you'd expect. Just figured I'd mention it since I didn't know that till yesterday and I figured that might mean other people also don't know.
    Wow that really is an obscure question.. Thank you for sharing!
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    I just want to get this over + done with now tbh. - too tired to do anymore stuff. ):
 
 
 
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