Qualification > Sciences
Edexcel CHEMISTRY DOUBTS!!!!
MKh:
--- Quote from: mandy12 on March 04, 2012, 01:42:37 am ---Can someone give me the revision for unit6b paper? i really don't know how to revise for that.. ???
--- End quote ---
The Chemistry laboratory skills II exam consists of 3 sections: qualitative analysis (identfying unknown compounds), quantitative analysis (calculations, graphs etc.) and Preparation (explaining the steps in a given experimental procedure for carrying out a preparation) of organic and inorganic compounds.
Check the Practical Assessment section in the Edexcel A2 Chemistry Revision Guide which is available for download in SF.
You will find very helpful information in that section. From the Revison Guide, I quote:
Qualitative analysis
Chemical reactions and tests that may be included in this section include:
- Any of those listed for Unit 3 (therefore you will also have to check the qualilative analysis section the Edexcel AS Chemistry Revision Guide)
- The reactions of the transition metal ions in solution with aqueous sodium hydroxide and with aqueous ammonia both added untl in excess (see pg 81 of guide)
- Ligand exchange reactions in copper (II) complexes (pg 79 of guide)
- The redox chemistry of chromium (pg 78 of guide)
[And the list goes on. It is better if you check the Guide itself]
Quantitative analysis
At least one of the following will be included in this assessment:
- pH titration
- Following the rate of a reaction
- Potassium manganate (VII) titration
- Finding the activation energy of a reaction
Preparation
Laboratory practices needed for preparation:
- Those developed at AS, such as heating under reflux and distillation
- Purification of an impure solid product by recrystallization from hot, saturated solvent
- Melting temperature determination
- Drying solid by filtration under reduced pressure - using a Buchner funnel and flask
Do make sure that you know how to draw labelled diagrams for the apparatus used to carry out distillation, reflux, filtration under reduced pressure and the ones used to determine melting and boiling temperature of a compound
Hope this helps.
SZM:
Hello guys,
can you tel me what is the difference between IN TERMS OF STRUCTURE AND BONDING in Iron (II) Chloride and Iron (III) chloride???
Please explain me clearly along with diagram...
Thanx in advance.
SZM:
hello guys, why no reply to my previous post???????????????????? Pls i need the answer for that immediately////
Romeesa-Chan:
--- Quote from: SZM on March 26, 2012, 03:51:27 pm ---Hello guys,
can you tel me what is the difference between IN TERMS OF STRUCTURE AND BONDING in Iron (II) Chloride and Iron (III) chloride???
Please explain me clearly along with diagram...
Thanx in advance.
--- End quote ---
The question is clear itself.
It asks to differentiate Iron Chloride (II) and Iron Chloride (III) in terms of their bonding and the structure of the molecule.
SZM:
--- Quote from: Romeesa-Chan on March 31, 2012, 08:12:04 pm ---The question is clear itself.
It asks to differentiate Iron Chloride (II) and Iron Chloride (III) in terms of their bonding and the structure of the molecule.
--- End quote ---
Sister Romeesa,
I want the answer for the difference between Iron (111) chloride and Iron (11) chloride??? i want the answer// So to explain this answer, pls ur answer shuld be in terms of their structure and bonding....
Hope u got my point. IN SHAA ALLAH.
Waiting 4 ur reply. Wasalaam.
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