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  1. Saturation

    Chemistry MCQ thread...

    Ok, but isn't SN1 (tertiary) the one with the intermediate? http://en.wikipedia.org/wiki/SN1_reaction
  2. Saturation

    Chemistry MCQ thread...

    A?
  3. Saturation

    Is calcium Hydroxide strong or weal!?

    Is calcium hydroxide a strong or weak base? I get that it's only slightly soluble, but then net says that whatever CaOH2 that does dissolve, completely splits up into ions!? Can someone explain this please!?
  4. Saturation

    Chemistry MCQ thread...

    but it's present in the carboxylic acid group!
  5. Saturation

    Chemistry MCQ thread...

    Someone help me out!: http://www.xtremepapers.me/CIE/Internat ... 5_qp_1.pdf question 25, whats the difference between A and D? For PCl5 to react with the molecules, they must contain the alcohol group right?
  6. Saturation

    Chemistry MCQ thread...

    For all those questions which ask final pressure or volume: I use the formula: (P1 x V1) + (P2 x V2) = (P3 x V3) P1 and P2 , being the pressures of the initial containers and P3 being the final pressure when they are connected together. V1 and V2 being the volumes of the initial containers...
  7. Saturation

    Chemistry MCQ thread...

    phew! so what I said earlier makes sense then? It's chloro flouro carbons which are used in extinguishers? (and btw some of the HALOGENOALKANES are extremely flammable!) There was an entire disscussion about this earlier in this thread or in the another one. Here's what I remember: diamond to...
  8. Saturation

    CHEM MCQ HELP

    Yeah, it's C, as said earlier, the only one that fits the criteria is 15 (P) , which has 1 electron in each of it's 3p orbitals.
  9. Saturation

    Chemistry MCQ thread...

    welcome! :) haha , ok then, and yeah the qs do repeat! btw please let me know if you find qs 5! Thanks!
  10. Saturation

    Chemistry MCQ thread...

    I know, but what about qs 5!? and what are the 3 alkenes for qs 4 pls! Thanks!
  11. Saturation

    Chemistry MCQ thread...

    Thanks, but can you tell me what the 3 alkenes are!?
  12. Saturation

    Chemistry MCQ thread...

    It's C4H8, : 0.2 mol produced 35.2g of CO2 and 14.4g of H20, which is 0.8 mol of CO2 and 0.8mol of H20 so now you have the ratio, 0.2 gave us 0.8, so 1 mol should give us 4 mol each. Now we have the balanced equation, so just adjust the number of carbon and hydrogen, to match equation: CxHy +...
  13. Saturation

    Chemistry MCQ thread...

    Isn't it C4H8?? What's the answer! yeah, thanks alot, btw for the 4th qs, what are the 3 alkenes!?
  14. Saturation

    Chemistry MCQ thread...

    Thanks, but for 5 is put B, but it's wrong! :/ Yeah, the questions are right!
  15. Saturation

    Chemistry MCQ thread...

    In 100g of fertiliser there are 15g of Nitrogen, so In 14g of fertilser, there must be 2.1g of Nitrogen (ratios!) number of moles of nitrogen = 2.1/14 = 0.15mol ( we divide by 14 because the qs says it's the Nitrogen element, so it isn't N2) concentration= 0.15/5= 0.03, so it must be A.
  16. Saturation

    Chemistry MCQ thread...

    Number 4 is NOT D and Number 5 is NOT B ! ( Cause these where the same answers I wrote, and they are wrong!) And number 3: I think it's D aswell! Number 5: I think it has to be D ( 1 only) , since chloroflourocarbons are used in fire extinguishers, so it must be only the 1st one. Can anyone...
  17. Saturation

    Kp changes?

    Yeah, thanks for confirming, I checked the net aswell, and it says the same! Cheers!
  18. Saturation

    Kp changes?

    Yeah, I know that temperature affects Kp, but does PRESSURE or CONCENTRATION affect it as well?
  19. Saturation

    Chemistry MCQ thread...

    These questions!: ( I just want to know the answers, since these qs were from a mixed up mock exam!) 1) What will react differently with the two isomeric alcohols, (CH3)3CCH2OH and (CH3)2CHCH2CH2OH? A acidified aq potassium manganate (VII) B conc. H2SO4 C PCl5 D Na 2) What is formed when...
  20. Saturation

    Kp changes?

    Ok, so the only factor which changes the value of Kc , is temperature. Is this the same case with Kp? I'm thinking so, since increasing the pressure of the gas = increasing the concentration of the gas. Can someone confirm this!? Thanks!
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