(Original post by Jamesrb)
hollywoodbudgie, you're amazing!!
I've been doing past papers all day, the earlier ones were far easy and now I see that in June 09 and Jan 10 Electrolysis seems to be popping up again. How much do we really need to know for this, I can't find much in my revision guide at all!
The other thing that is really getting me are the conditions for all of the various reactions and reagents, I have no idea how to remember them and for what reactions they are for!
The last thing...OMG WHAT CAN I DO ABOUT THE ADVANCED NOTICE STUFF? lol. seriously though, is there much i can do with it tonight or in the morning? (I'll be up at 6.30)
Thanks SO much in advance!!
Reagents and Conditions:
Originally Posted by kirky743
(thanks to this amazing person!)
Oxidation of primary alcohol - excess potassium dichromate solution that has been acidified with weak sulphuric acid. This is distilled to form an aldehyde.
Oxidation of secondary alcohol - excess potassium dichromate etc as before. Heated under reflux to form a ketone.
Alkene ---> Alcohol : reagent is water at 70ATM pressure, 300 degrees C and in the presence of a phosphoric acid catalyst.
Hydrogenation - (alkene to alkane) -EITHER hydrogen gas at 180 degrees and 5atm pressure with a hot nickel catalyst OR room temp and pressure with a platinum catalyst
Alcohol ---> halogenoalkane - react with the acid of the halogen (HBr, HCl...)
Alcohol ---> Alkene : EITHER 180 degrees c with concentrated sulphuric acid OR hot vapour over Al2O3 at 300 degreees
Alkane ----> alkene is vapour over Al2o3
Halogenoalkane ----> amine : react with concentrated NH2 in a sealed tube
Halogenoalkane -----> Alcohol. Reflux with excess NaOH
Whenever you're not sure, just put down reflux because odds are it is.
And if it's 3 marks and you're not sure, guess concentrated sulphuric acid and reflux
It usually works!
DW about advanced notice stuff too much.
All it does is give you the context for the exam. It won't make up strange questions.
Worse come to worse you'll be asked to apply your own knowledge, but all this knowledge
comes from the syllabus so just think what science crap it's trying to get you to say!
Looks like it focuses on the atmosphere. Think global warming, ozone, and radiation
all that stuff ^^
Hope that helped you in some way.