OCR Chemistry A F322 Chains, Energy and Resources Wed 23 May 2012

looool even though its gonna be like a really short rest of maybe 4 weeks at the most imma enjoy it man CHEMISTRY for the last seven months has been my life :/

haha same here!!! cant wait till i finish it imma walk out the hall with my music so loud and i have movies and games and outings to do i feel like a bird with one wing atm but tomorrow imma be a mfckkking hawk!!!!

Is cyclopentanol a secondary or primary alcohol? Because when you reflux it with an acid catalyst you get a ketone. Q8a jan 2012. I'm confused!



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hydrolysis: hot aqueous alkali,
test hydrolysis on halgenoalkanes:
method 1:
ethanol, waterbath-60c, AgNO3,
-measure rate of precipitation,
-Ag+X-,
method 2:
Naoh, HNO3 to neutralise it, AgNO3,
-measure amount of precipitation,

bond enthalpy>bond polarity,
bond strength:
RC-cl>RC-br>RC-I,

HYDROLYSIS:
rc-i>rc-br>rc-cl,

Agcl:white precipitate, Agbr:cream precipitate, Agi:yellow precipitate,


Co2
-catalyses break down of ozone,
-absorb ir and contributes to global warming, long life,
-acidifies lakes,

CSS:
-inject liquidified co2 under seabed,
-porous rocks,
-old minefields/oil fields-also helps extract last bit of oil,
-carbonates (metal),

-supercritical carbon dioxide can be used in decaffeinating, and dry cleaning,
-blowing agents in foam,
-as a solvent,
feedstock for chemical reactions,


hydrogenation:
-nickel catalyst, 150c, add hydrogen across double bonds,

ziegler-natta:
ziegler catalyst, TiCl3, Al(c2h50h)2cl,
-forms un-branched polymers-polyethene,

radical polymerisation:
-200c, high pressure,
-branching of polymer chain,



esterification:
alcohol + carboxylic acid,
conc h2so4, warm,

dehydration of alcohols:
-h3po4, reflux,

oxidation:
orange->green, acidified dichromate-h+/cr2o7-2,

Polymers::
-when burnt give of toxic substances,
-very strong bonds or non-polar, therefore unreactive and biodegradable,

solutions:
-make biodegradable/compostable,
-incineration/combustion,
-cracking,
-feedstock,
-recycling and sorting, reclamation,
-removal of toxic groups,

-polystyrene-foam packaging,
-polythene-grocery bags,


CFCs:
-very strong unreactive bonds that are broken by UV light to create radical,
-damages ozone layer,
-refrigerants, medical aerosols, fire extinguishers, propellants,
-banned by montreal protocol,
-long lifetime,
-replaced by HCFCs,

sustainability:
-biodegradable, non-hazardous/toxic, cost-effective, environmental-friendly, high atom economy, less waste,
-green bags, catalysts, recycling,


If you can find any mistakes please feel free to correct me.

Good websites with questions+markschemes:
http://www.a-levelchemistry.co.uk/OCR%20Chemistry%20A/Unit%202/Unit%202%20resources.html

(http://www.a-levelchemistry.co.uk/OCR%20Chemistry%20A/OCR%20Chemistry%20A%20home.html)

How is ocr bio loads of my mates said yesterday exam was hard... is it heavily based on application or mainly memory?

Secondary because it's carbon is attached to two other carbons- I think.

stop fkin moaning at ocr, exams are meant to be fkin hard you dumb hood rat

shifting to the right would mean more stuff on the right hand side of the equation will be produced, shifting to the left means more stuff on the left hand side of the equation would be produced....

CAN PEOPLE PLEASE PLEASE EXPLAIN
DYNAMIC EQUILIBRIUM.
I grasp that if you change something it will do the opposite to minimise the change etc...

i just don't understand why...

e.g:
explain why the effect of the equilibrium above of an increase in pressure.

thankyou

I do, I could email it you if you like?

I need someone's advice, I have two past papers left to do, should I go through them or forget about them and focus on learning the stuff as I'm quite weak in areas? Seeing as there's not much time left and it would probably stress me out more..

Does anyone have the Jan 2012 paper that they could send me? I cannot find my copy anywhere!!

it's 100 KPa btw... prob a typo