IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => GCE AS & A2 Level => Sciences => Topic started by: Meticulous on May 10, 2010, 10:16:45 pm

Title: A QUICK YES OR NO QUESTION. EDEXCEL CHEMISTRY AS
Post by: Meticulous on May 10, 2010, 10:16:45 pm

Is infrared spectroscopy IN the syllabus(not the book)?

Should we study it for unit 3B?

Title: Re: A QUICK YES OR NO QUESTION. EDEXCEL CHEMISTRY AS
Post by: Dento on May 10, 2010, 10:25:47 pm

not really, learn it just in case, paper will be mostly organic reactions + mole calculations. you can expect anything from edexcel's examiners.

Title: Re: A QUICK YES OR NO QUESTION. EDEXCEL CHEMISTRY AS
Post by: Meticulous on May 10, 2010, 10:26:54 pm

Thanks for your time.

Title: Re: A QUICK YES OR NO QUESTION. EDEXCEL CHEMISTRY AS
Post by: Dento on May 10, 2010, 10:29:06 pm

nvm, no worries about unit 3, its simple .. solve the previous years, not only the 2009 and 2010 papers, solve also the old papers, they aer much similar to new paper as well.

Title: Re: A QUICK YES OR NO QUESTION. EDEXCEL CHEMISTRY AS
Post by: Summer :] on May 11, 2010, 04:44:02 am

Quote from: The Gladiator on May 10, 2010, 10:16:45 pm

Is infrared spectroscopy IN the syllabus(not the book)?

Should we study it for unit 3B?

nop, you dont need it..
we just need the chapters up to organic chemistry for unit 3..approximately :)

Title: Re: A QUICK YES OR NO QUESTION. EDEXCEL CHEMISTRY AS
Post by: coatseville on May 12, 2010, 07:19:44 pm

Basically every paper is similar you should review everything but if you dont have time you MUST make sure you know
1) Analysis
2) Moles & titration calculations
3) Alcohols, Ketones and Aldehydes
4) How to draw and use reflux, distillation, titration
5) preparing a standard solution

Hope that helps!

Title: Re: A QUICK YES OR NO QUESTION. EDEXCEL CHEMISTRY AS
Post by: abuelzouz on May 12, 2010, 07:21:23 pm

+ Flame tests and other test we took in igcse

Title: Re: A QUICK YES OR NO QUESTION. EDEXCEL CHEMISTRY AS
Post by: Meticulous on May 12, 2010, 07:33:34 pm

Thanks all for your help.

But you're saying I need to know how to prepare a standard solution. Should I know ALL the details. If so, can you jot them down here.

Thanks again mate.

Title: Re: A QUICK YES OR NO QUESTION. EDEXCEL CHEMISTRY AS
Post by: coatseville on May 12, 2010, 07:58:22 pm

Okay so for the analysis you know that you need to know cations, anions, some organic and gas tests.. thats really important.
For a standard solution:-
1) calc. the mass of the solid need to make the solution of the required conc. (ie use the equation..)
2) Measure out the mass using a top pan balance
3) tip contents of mass into a beaker - and wash the apparatus tht u used to record the mass with distilled water (ensure complete transfer of mass)
4) Add a small vol. of distilled water (approx 50cm3 if prep of a 250 cm3 solution) & mix using a glass rod until all solid dissolved (may require heating)
5) Pour solution into a standard flask - wash apparatus used (ie glass rod) with water also and put washings into flask.
6) Continue adding distilled water to the solution until it is level with the bottom of the meniscus on flask.
7) Stopper the flask and mix/shake.

Hope this helps!

Title: Re: A QUICK YES OR NO QUESTION. EDEXCEL CHEMISTRY AS
Post by: Meticulous on May 12, 2010, 08:14:56 pm

Thanks a lot.

+rep.

Title: Re: A QUICK YES OR NO QUESTION. EDEXCEL CHEMISTRY AS
Post by: ig student on May 13, 2010, 02:13:31 am

the specification for the practical exam is attached below