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  1. angelicsuccubus

    Chemo P5 tips

    Did anyone compile notes for p5? Or can anyone just list all the experiments that have come up?
  2. angelicsuccubus

    Chemistry: Post your doubts here!

    i found it on a chem balancin website
  3. angelicsuccubus

    AS Chemistry P2 Prep.

    saudha angelgirl:) I have it as heat under reflux in my notes, so I'd say stick to that.
  4. angelicsuccubus

    Chemistry: Post your doubts here!

    yeh I think Ive seen one .. thats how I remember it being 104.5 as the answer..
  5. angelicsuccubus

    Chemistry: Post your doubts here!

    its like H2O so 104.5.. The H2S molecule has two lone pairs. These exert a greater repulsion than one lone pair and the hydrigen atoms are squeezed together to give n angle of 104.5
  6. angelicsuccubus

    AS Chemistry P2 Prep.

    np
  7. angelicsuccubus

    AS Chemistry P2 Prep.

    im getting 18 both times.. Carbon has 6 electrons, H has 1 electron so in CH3CH3 its 6+3+6+3= 18 and in F has 9 electrons, so 6 + 3 + 9=18
  8. angelicsuccubus

    Chemistry: Post your doubts here!

    Im not adding it.. thats what happens It's either the one with oxygen, or this one: PbO2 + 2 H2SO4 = 2 H2O + Pb(SO4)2
  9. angelicsuccubus

    Chemistry: Post your doubts here!

    dude chill, okay? and if you wanna discuss chem p4, do it here.
  10. angelicsuccubus

    Chemistry: Post your doubts here!

    Here: Take half equation from this 2 PbO2 + 2 H2SO4 = 2 H2O + O2 + 2PbSO4
  11. angelicsuccubus

    Chemistry: Post your doubts here!

    Check the guidelines in the syllabus too and check this: http://www.xtremepapers.com/community/threads/chemo-p5-tips.5917/
  12. angelicsuccubus

    Chemistry: Post your doubts here!

    hey.. umm they are all the same equations. Where did you find this question? and is it half equations that you're confused about?
  13. angelicsuccubus

    Chemistry: Post your doubts here!

    there's a chem p5 tips thread too.. read that too.
  14. angelicsuccubus

    Chemistry: Post your doubts here!

    thanks =]
  15. angelicsuccubus

    Chemistry: Post your doubts here!

    We had a conversation about it earlier on the thread but I'll explain it again. There are 2 main types of intermolecular forces (so these are between molecules not atoms..): Van der Waal's forces Instantaneous dipole- Induced dipole (London forces) - these are betwen non polar covalent...
  16. angelicsuccubus

    Chemistry: Post your doubts here!

    enthalpy change= enthalpy of products - enthalpy of reactants... always when you have only these two or an enthalpy profile. If you have stuff like enthalpy of reaction or formation to find from enthalpy of combustion or enthalpy of formations... then use a Hess's diagram.
  17. angelicsuccubus

    Chemistry: Post your doubts here!

    When you see that the question is asking you to make boromobutane from butanol ... you have to remember that an alcohol needs HBr for this reaction to occur. After that you have to think of an equation/reaction of NaBr that will make HBr ... and NaBr + water will not give you HBr.. Sodium...
  18. angelicsuccubus

    Chemistry: Post your doubts here!

    what are you confused about? Basically they are asking what are the products of a reaction between conc. sulfuric acid and sodium bromide, and the reaction between butanol and conc. sodium bromide. 2NaBr + 2H2SO4 -----> Na2SO4 + Br2 + 2H2O + SO2 and an alcohol can be dehydrated by a strong...
  19. angelicsuccubus

    Chemistry: Post your doubts here!

    anytime =]
  20. angelicsuccubus

    Chemistry: Post your doubts here!

    yeh yeh yeh.. go back up to my previous post, I edited it.
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