Almost 5 days remaining for this exam... I am creating a list of things you should know for this exam. Please help me complete this list.
Test for Halides
Preparation of aldehydes using simple distillation and carboxylic acids by heating under reflux
Preparation of halogenoalkanes
Test for alkenes using bromine water and acidified potassium per manganate
Test for halide present in a halogenoalkane by warming with sodium hydoroxide dissolved in ethanol followed by dilute nitric acid (to neutralize OH) and silver nitrate followed by ammonia solution
Distinguish between aldehydes and ketones using Benedicts or Fehlings solution. Formation of red precipitate confirms aldehyde
Drawing apparatus for simple distillation, heating under reflux and seperation of two immiscible liquids (dropping funnel)
Test for sulfates, sulfites and carbonates using barium chloride solution
Energetics: Enthalpy of neutralisation, combustion and displacement (by shumen9523)
Rates of reaction (by shumen9523)
Reactions of group 2 and group 7 elements
Volumetric analysis: esp thiosulfate
Test for SO2, CO2, H2 and O2. (by sankait36): SO2 - turns acidified potassium dichromate(VI) from orange(Cr6+) to green(Cr3+), CO2 - turns lime water milky (due to insoluble calcium carbonate), H2 - test with burning splint, ignites with a pop sound, O2 - relights a glowing splint
A little thing which I don't think on the syllabus is the adding of universal indicator to a fully oxidised primary alcohol just double check it does become a Carboxylic acid... If it doesn't there's something wrong
Also include the test to confirm presence of -OH group in alcohol and carboxylic acid (Adding PCl5, giving steamy fumes (of HCl gas) OR Adding Sodium, we see bubbles (of H2 gas) and a white precipitate)
also the test for ammonia gas (white fumes with a drop of conc. HCl),
This is really helpful! thanks for starting this thread Yeah like everyone said you got pretty much everything and I too am sitting for this exam on Wednesday
GOOD LUCK TO EVERYONE!!! MAY WE ALL ACE IT :P
Yeaah but what about the recrystallisation method and
especially the preparation of 250cm3 standard solution! it soo long!! :O or cud anyone brief it out?
N any common questions in the papers?
or predicitons? for fun :P
btw do we have anything else to practice from? any old papers....than just the recent 6papers beginning from june 2009 to jan2012!!
Good Luck all
**takes deep breath* standard sol is pretty long buddy, here goes.. :P
1) Calculate mass of solid required to make a solid of the required conc.
2) After that place a weighing bottle a top pan balance and press the tare button so the balance is set to 0, then add the solid to the bottle until you have the required mass of the solid u calculated in 1)
3) After measuring the mass, tip the contents of the weighing bottle i.e the mass into a beaker and wash any remaining solid from the bottle in the beaker
4) Then ADD about 50CM3 of distilled WATER to the beaker, and stir the contents of a beaker using a glass rod , you might need to HEAT the beaker in order to dissolve the solid.
5) After take a funnel and a 250cm3 standard flask and set it up, then pour the contents of the beaker into the funnel, make sure all the washings go through the funnel and into the FLASK
6) Then add more distilled water to the flask until it the bottom of the meniscus is level with the mark on the standard flask.
7) FINALLY you put a stopper on the flask and shake..SHake.. SHAKE that flask and make it POP! :P lol jkin shake the flask thoroughly so the solution is mixed well.