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  1. T

    The Banning Game(ALL please join in)

    Banned for spelling 'baned'
  2. T

    The Banning Game(ALL please join in)

    Banned for having an overly colourful status message
  3. T

    AS Chemistry P2 Prep.

    The examiner isn't there to punish you, they are there to test your knowledge, they will accept both because they are both correct
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    M1

    I think we can since edexcel exams are taken about the same time around the world. I thought the exam was ok, similar in difficulty with the last few years. Everything was straightforward i guess. So what marks are you aiming for?
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    Post your S1 doubts here! Or any tips and useful material!

    OK thx! :) If anyone else has other opinions, do tell!
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    Post your S1 doubts here! Or any tips and useful material!

    can anyone help me out please?
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    Post your S1 doubts here! Or any tips and useful material!

    You know when you draw scatter diagrams in the exams, are you allowed to put that squiggle to show a break in the axis, because sometimes it results in my y-intercept being off the page. On the other hand, if you try to do june 2004 question 2, your diagram will look ridiculous if you dont draw...
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    Chemistry: Post your doubts here!

    The first 3 images is what you are looking for http://en.wikipedia.org/wiki/Butene
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    Chemistry: Post your doubts here!

    oops yeah i meant but- not pent- sorry! im finding one now
  10. T

    Chemistry: Post your doubts here!

    Wikipedia has the skeletal formulas for them: http://en.wikipedia.org/wiki/Pentene Tell me if you have trouble reading skeletal formulas, I'll find another image EDIT: wikipedia uses the american naming system so 1-pentene is pent-1-ene, etc.
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    Chemistry: Post your doubts here!

    I've read your previous discussion about the question and I see why you don't understand. The question asks for ANY isomer with C4H8 and with a double bond other than the one shown in the diagram. The diagram shown is just one example, you can ignore it when drawing other isomers Like I said...
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    Chemistry: Post your doubts here!

    Do you need me to explain more???
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    Chemistry: Post your doubts here!

    There are 3 isomers with a double bond: cis pent-2-ene trans pent-2-ene pent-1-ene Answer C
  14. T

    Chemistry: Post your doubts here!

    Could you please repost the question? I wish to take a look
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    Chemistry: Post your doubts here!

    when an alcohol is oxidised to a carbonyl, it is not considered a condensation reaction even though H2O is formed, can someone explain?
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    Chemistry: Post your doubts here!

    There are many, to name all of them would be difficult. Just remember planar= either 2 bonding pairs(180) or 3 bonding pairs(120) or 2bonding pair with 1 lone pair(120)
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    Chemistry: Post your doubts here!

    Sorry I was gone for awhile, where was I... Normally we don't but you have to understand the maths going on here... OK, alternative method. Assuming we have 2 moles of the nitrate 2X(NO3)2 --> 2XO + 4NO2 + O2 Masses will be: (248+2x)g-->(32+2x)g +(216 )g x is 1 mole Real masses are: 5g...
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    Chemistry: Post your doubts here!

    216 grams is 4NO2 + O2 N=14grams per mol O=16 grams per mol
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    Chemistry: Post your doubts here!

    let metal be X 2X(NO3)2 --> 2XO + 4NO2 + O2 5g ............ --> 1.71g +[ 3.29g ] Mass of 1 mole of (4no2+ o2)=216grams There are 3.29/216 moles of (4no2+o2)present Also 3.29/216 moles of 2XO present Therefore there is (2*3.29)/216 moles of XO molar mass of XO = g/mol=...
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    Chemistry: Post your doubts here!

    A level questions only!!! :) Anyway the answers are 1. C, because cooling a material causes it to lose heat energy, so energy is lost in the cooling tube 2. B, because during change of state there is no temp change, so its B or D, but melting is at a lower temp than boiling, so B
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