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  1. angelicsuccubus

    Chemo P5 tips

    ehh... at the risk of soundin like a complete idiot, I don't think I got it.
  2. angelicsuccubus

    AS Chemistry P2 Prep.

    I haven't seen anything other than alkenes get polymerised
  3. angelicsuccubus

    AS Chemistry P2 Prep.

    I just started looking at the p5 papers, wtf?! Im so lost! the markschemes are like uber-useless!
  4. angelicsuccubus

    AS Chemistry P2 Prep.

    trust me that girl got it, and now she's gone to sleep .. so no point in quoting now.
  5. angelicsuccubus

    Chemo P5 tips

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s10_qp_51.pdf how do you calculate the volume in 1 a?
  6. angelicsuccubus

    AS Chemistry P2 Prep.

    oh oh I misquoted! I meant to quote the post before you, sorry
  7. angelicsuccubus

    AS Chemistry P2 Prep.

    I thought she asked why it went orange...
  8. angelicsuccubus

    AS Chemistry P2 Prep.

    Yeh it happens with Bromine too.. and I said earlier when I posted these, I'm sorry if I missed any so just fix the list. I didn't go through esters or carboxylics so I probably missed stuff from there.. and I thought aldehyde--> carboxylic was pretty obvious but oh well.. and I didn't have heat...
  9. angelicsuccubus

    AS Chemistry P2 Prep.

    Organic chem reactions that use heat reflux: Nucleophilic substitution of alcohols with a mixture of red phosphorus and Bromine/Iodine Oxidation of primary alcohols to carboxylic acids Oxidation of secondary alcohols to ketones Nucleophilic substitution of halogenoalkanes with NaOH to form...
  10. angelicsuccubus

    AS Chemistry P2 Prep.

    I haven't done those papers.. so if they mention it being in a school lab, we don't write reflux?
  11. angelicsuccubus

    AS Chemistry P2 Prep.

    probably not here, but its best to remember which use reflux and which don't because sometimes writing reflux is incorrect and sometimes heat only is incorrect. In november 07, for the KCN reaction they wrote heat under reflux... so for that reaction, stick to heat under reflux. For the...
  12. angelicsuccubus

    AS Chemistry P2 Prep.

    no that's okay, they tend to write incomplete stuff in the mark scheme.. but if you wrote heat with reflux or heat it would be right. The process in real life would use a refluxing column.
  13. angelicsuccubus

    AS Chemistry P2 Prep.

    thank god.. I was beginning to lose it myself XD
  14. angelicsuccubus

    AS Chemistry P2 Prep.

    It's a theory which assumes certain things about an ideal gas--------> the molecules behave as rigid spheres there are no/negligible intermolecular forces between the molecules collisions between the molecules are perfectly elastic the molecules have no/negligible volume the molecules move in...
  15. angelicsuccubus

    AS Chemistry P2 Prep.

    but it doesn't! If I ask you to supply strong heat to the pot of water on the stove, you are going to increase the flame under the pot, you're not going to reflux it are you?! Refluxing provides strong heat, but providing strong heat does not mean refluxing. Because reflux is the name of the...
  16. angelicsuccubus

    AS Chemistry P2 Prep.

    that means you're giving it heat by radiation or a bunsen burner or a reactor.. or anything.. but not refluxing it, and so if the condition is meant to be reflux, its important that you write reflux. Organic chem reactions that use heat reflux: Nucleophilic substitution of alcohols with a...
  17. angelicsuccubus

    AS Chemistry P2 Prep.

    "Reflux is a distillation technique involving the condensation of vapors and the return of this condensate to the system from which it originated. It is used in industrial and laboratory distillations. It is also used in chemistry to supply energy to reactions over a long period of time."
  18. angelicsuccubus

    AS Chemistry P2 Prep.

    that means "heat under reflux"
  19. angelicsuccubus

    AS Chemistry P2 Prep.

    because heating and reflux heating is not the same thing. Reflux is important when you're tryna make sure, no gases and stuff are lost... but sometimes it's just heating.. providing heat... isn't the process of heat refluxing... so don't think of them the same at all.
  20. angelicsuccubus

    AS Chemistry P2 Prep.

    umm cause that's the colour of 2,4-dinitrophenylhydrazone (it's the product of the reaction between an aldehyde/ketone and 2,4-dinitrophenylhydrazine)
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