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  1. Saad (سعد)

    AS Chemistry P2 Prep.

    No one? :cry: Also, Paper: Click Me Mark Scheme: Yeah, Click Him, Why Dontcha'? Question 3; the whole question. Someone please explain it to me in detail. Jazak Allah Khayr.
  2. Saad (سعد)

    AS Chemistry P2 Prep.

    Does anyone have a Summary or something of Inorganic Chemistry reactions? I found one of Organic Chem., so one of Inorganic Chemistry would be useful. :)
  3. Saad (سعد)

    AS Chemistry P2 Prep.

    Are you 100% sure? Because in the MS the Examiner gives almost always gives answers in fractions... that's why I asked...
  4. Saad (سعد)

    AS Chemistry P2 Prep.

    Another one; which way of writing equations is better; 2NO + 2CO --> 2CO2 + N2 ? OR NO + CO -->CO2 + 1/2N2? I mean, is balancing the equations in fractions preferred in AS Level or in whole numbers?
  5. Saad (سعد)

    AS Chemistry P2 Prep.

    I think I get it now... Now, the real challenge is not to forget. >.< Thanks guys.
  6. Saad (سعد)

    AS Chemistry P2 Prep.

    (CH3)2=CH2... you meant that to be this, right? (CH3)2C=CH2... so the CH2 at the end would turn into CO2 and H2O, and and the '(CH3)2C=' turns into a Ketone with 1 CH3 above the '=C=O' group and 1 below... is that right?
  7. Saad (سعد)

    Chemistry: Post your doubts here!

    That's a typo in the Mark Scheme. They meant to write Ethene; they've written the formula of Ethene, C2H4. Ethane is C2H6.
  8. Saad (سعد)

    AS Chemistry P2 Prep.

    Jazak Allah Khayr. Can someone please explain to me the reactions of KMnO4 on Alkenes? Also, why does only KMnO4 show that kind of reaction with Alkenes; why doesn't K2Cr2O7, as they're both oxidizing agents?
  9. Saad (سعد)

    AS Chemistry P2 Prep.

    CIE standards are falling... :p Anyways, so what's the real shape?
  10. Saad (سعد)

    AS Chemistry P2 Prep.

    Look again. The C on the right has 2 bonds with the C on the left, 1 bond with Br, 1 with CH2Br and 1 with H. That's 5 bonds total. The C on the left has 2 bonds with the C on the right, 1 bond with H, 1 with CH3 and 1 with the R-side chain. That's also 5 bonds total. So each Carbon atom has...
  11. Saad (سعد)

    AS Chemistry P2 Prep.

    2 bonds, 0 lone pair = Linear, 180 degrees, ex: CO2 2 bonds, 1 lone pair = Angular/Bent, 117 degrees, ex: SO2 2 bonds, 2 lone pair = Angular/Bent, 104.5 degrees, ex: H2O. 3 bonds, 0 lone pair = Trigonal Planar, 120 degrees, ex: AlCl3 or BF3 3 bonds, 1 lone pair = Trigonal Pyramidal, 107 degrees...
  12. Saad (سعد)

    AS Chemistry P2 Prep.

    Now, someone, please kindly, riddle me this. Question 4, (f), (iii): Paper: Click Me Mark Scheme: No, Me!!! ... Why on planet Earth do those carbon atoms (in the mark scheme answer) have five bonds each? :eek::confused:
  13. Saad (سعد)

    AS Chemistry P2 Prep.

    Angular/Bent, 117 degrees. An example is SO2.
  14. Saad (سعد)

    Chemistry: Post your doubts here!

    Thank you. Now, someone, please kindly, riddle me this. Question 4, (f), (iii): Paper: Click Me Mark Scheme: No, Me!!! ... Why on planet Earth do those carbon atoms (in the mark scheme answer) have five bonds? :eek::confused:
  15. Saad (سعد)

    Chemistry: Post your doubts here!

    Please explain the times when the MS gives Products - Reactants instead, because the Examiner uses both.
  16. Saad (سعد)

    Chemistry: Post your doubts here!

    This I need an answer to as well... I get this wrong almost every single time. When I memorize Enthalpy change of products - reactants, and solve a paper, the MS says reactants - products. When I do that in the next paper, THEN the MS goes back to Product - Reactants. X_x
  17. Saad (سعد)

    Done. Sorry.

    Done. Sorry.
  18. Saad (سعد)

    Chemistry: Post your doubts here!

    Sulfur has 6 electrons, forms two bonds with two Os which makes 8 shared electrons. Which makes, as you taught, 4 shared electron pairs. 2 of these are bond pairs because there are 2 oxygens; doesn't that leave behind 2 lone pairs on the sulfur?
  19. Saad (سعد)

    Chemistry: Post your doubts here!

    At very high pressures or very low temperatures, in both cases, gas molecules are too close together and intermolecular forces have a large effect. This prevents the gas from behaving ideally, because an ideal gas has 'no' intermolecular forces. Hope that helps.
  20. Saad (سعد)

    AS Chemistry P2 Prep.

    o.o; Hmm... I guess. Edit: Question; Summer/June 2004, question 3, part (d): Paper: Click me! Mark Scheme: No, click me! Is it important to show the 'balloon'-shaped thing over ammonia for the lone pair that's drawn in the Mark Scheme? If so, why, because in the question they only asked...
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