Qualification > Sciences

Need HELP on CIE Chemistry AS/A2 level

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The SMA:

--- Quote from: tmisterr on May 03, 2010, 07:15:24 am ---Ah sorry, for 40 u are right its ester not ketone, was a bit in a hurry but the point is  there is no aldehyde group so it will not react with fehling's reagent.
for q10 forward reaction is combustion, all combustions are exothermic. but its just an example. Kc and Kp are only affected by temp, nothing else. if was an endothermic reaction go the right then increase in temp increases products so Kp rises e.Take Care. Kp and Kc are used to give you an idea on whether the reaction is moving right or left.

--- End quote ---

Its ok. I understood everything now. Thanks again for making it more clear  :)

The SMA:

--- Quote from: The SMA on May 03, 2010, 06:45:41 am ---Need more help in O/N 2008 p1
q8,14,17,22,31,35,38

--- End quote ---

could someone help me in explaining these questions please?

nid404:
yes, when i log in next

The SMA:
ok nid  ;)

nid404:
14) C SO2 always first convert to SO3...so basically even when you do reaction with water, it converts to sulphurous acid first, sulphuric later

17) D because if you notice the reaction with iodide. I2 as vapour is formed with H2SO4...ox state 0  whereas with H3PO4, it is HI that forms..ox state of I is -1 So higher ox state with sulphuric acid, which shows it oxidises better...

Q22) A & B ruled out at the very start....no chiral possible, no isomerism either
        C not possible cause you can't have a chiral...try substituting an  H with a chlorine...try all possible subs ....no chiral..Hence D (second from left substituted, you get chiral)

I have to leave urgently....I'll get back from school and answer :)

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