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ALL CIE CHEMISTRY DOUBTS HERE !!

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NidZ- Hero:
i have couple of doubts It Would be Great if Some one Could Help

http://www.freeexampapers.com/get_past_papers.php?l=Past_Papers%2FA+Level%2FChemistry%2FCIE%2F2002+Nov%2F9701_w02_qp_1.pdf
Questions : 8 ,29, 39


http://www.freeexampapers.com/get_past_papers.php?l=Past_Papers%2FA+Level%2FChemistry%2FCIE%2F2006+Nov%2F9701_w06_qp_1.pdf
Question : 4 , 5 , 6 , 9 , 11 , 14 , 23 , 27 , 37.

http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s07_qp_1.pdf
Question : 9 ,26


ASAP
Thanku

Ghost Of Highbury:
This isn't a 'couple of doubts', it's almost half a paper :P

I have to sleep in a bit, so i'll do w06 questions very quickly. Hope someone can help u with the other 5

4) Construct balanced equations of the combustion. Find out how much volume of O2 hasn't reacted or is in excess. Find out the volume of CO2 given off using mole concept, add 'em up. Do this for all the alkanes.

5) B, sideways overlap. Weak bond. The rest are head to head

6) Ammonia has a lot of different types of bonding between the molecules, hence it deviates the most from the ideal gas. H2 is the closest to an ideal gas, hence straight line. D

9) Use this hess's cycle.

   H2 + CO + 0.5O2 ---(-283)---> CO2 + H2
               \                        /
                \(-286+44)        /
                 \                   /
                  V                V
                   CO + H2O(g)

11)   acid     alchol        ester        water
         1          1             0              0
       1-x       1-x           x                x

(x^2)/(1-x)^2 = 4
Solve for x

14) Calcium nitrate -> calcium oxide + NO2 + O2
Balance, convert to moles, find out the mass of CaO remaining.

23) B - Different groups attached to each Carbon will produce the cis trans.

27) B - Tertiary alchol, so doesn't get oxidized. No reaction. Forms ONa and gives H2 gas.

37) This is a tough one. Can't draw now, but i'll tell u what to do. break the double bonds and put O atoms to each carbon broken from the double bond. See if the 2 products contain a ketone group. One gives an aldehyde group if i'm not wrong. try it

Good luck, I hope you do great tomorrow :)

Night

perky:
guyyyyyyyssss any guess for ppr31 practical ?

whale95:
Are hydrocarbons are all incombustibles? and explain :) Thanks you

astarmathsandphysics:
hydrocarbons incombustibles? Tell my car

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