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astor

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Posts posted by astor

  1. I liked the one from Caroline Sullivan:a short but well-written review.

    The other one is short... Well written? Hmm.

    "During Mika's (g)imperial phase, around the time Sienna Miller was a style icon, one would sigh and say, 'I wish he'd dial it down' especially as he was singing that patronising song about plump girls. Be careful what you wish for. This comeback single is oddly subdued: Mika claims he wants 'the whole world to celebrate', but sounds like he just signed up for Dancing On Ice. Meanwhile, Pharell can barely be arsed to sound like himself."

  2. Anybody any good at Chemistry? I thought I was ok, but I'm in a pickle!What is the difference between Mr and RAM (relative atomic mass)? I thought there wasn't any, but there seems to be one, and it relates to finding the molecular formula from the empirical formula, as well as other stuff. Also, I'm stuck on questions like this:

     

    Nickel combines with carbon monoxide to form nickel carbonyl, Ni(CO)x ( x is subscript like in H2O). When 2.95g Nickel was heated with carbon monoxide,it was converted completely into 8.55g nickel carbonyl. Find the mass of CO which combined with 2.95g Ni and hence find the value of x in the formula.

     

    I made a little equation:

     

    2.95g+CO->8.55g

    so CO=5.6g

     

    And the Mr (arghh!) of CO is 12+16=28

    Then I put it into the equation

     

    no. of moles= mass/Mr

     

    so then 5.6/28=x

    but this is not going to be a nice integer value that would be the right answer and I cannot see where I went wrong. I had the same issue with the next question I tried, so I think the problem is with my method. Anybody know what to do?

    Thanks for reading this. It's quite long.

    As I understand it, Mr is the RAM(I guess this is the same as Ar?) of all the elements in the compound added together. So it basically means the same thing, but Mr is used when it is talking about compounds, and RAM is elements.

     

    I assume you're doing AS level too as I am on this as well. I asked the teacher about the values being ridiculous and she said it isn't like GCSE when they all come to satisfactory numbers, it can be a bit random and you have to use 3 sig figs.

     

    However I didn't check the question or your working, so can't say anything else. Sorry :aah:

  3. This is what I was trying to say yesterday. North Americans call that the 4th floor because there are 4 storeys between the actual physical ground and the roof. I really can't adjust to the concept that the ground floor is not the first floor. It's a floor and it's the first one so how can it not be the first floor? :lmfao:

     

    Goodness knows. I have this problem every day trying to get to lessons. :aah:

  4. Aha, that sounds a bit weird :blink: Maybe they meant that even though the elements are in the same periode they can be very very different :wink2:

    You're welcome, just glad someone asked something I could answer :aah:

    Yes, that's probably right! AHH.

    (Can you be my adoptive chemistry teacher? :puppy_eyes::naughty:)

  5. Finally something I know :mf_rosetinted:

     

    If i understood the question right they are different because Na is in period three so it has three electron shells, but Ne is in period 2 so it has only two electron shell and are therefore smaller.

    So

    Ne periode 2 - 2 electron shells

    Na periode 3 - 3 electron shells

     

    the more electron shells you have the bigger the atomic radius is.

     

    I hope that's the answer you want :wink2:

    That's the logical answer, and what my teacher said today, so thank you! :teehee:

    I was confused because I looked on some internet site and they said you can't really compare noble gases with non-metals or something :blink: But I don't know, you're right anyway, thank you :naughty::huglove:

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