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ALL CIE CHEMISTRY DOUBTS HERE !!

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donhassan:
well here is the question


if we have a cell made up of

AG ion + e=ag   E=0.80v
CU ion + 2 e=cu   E=0.34

if we add water to cu ion/cu beaker and let AG content remain same  will the EMF increase or decrease and WHY ?

tmisterr:
SInce Ag+/Ag cell has a more positive E value, silver ions will be reduced to silver and copper metal will be oxidized to copper ions. the EMF of the cell (Ered-Eoxd) is therefore 0.8-0.34=0.46v. when you add copper ions, it will dilute the Cu2+/CU cell so from you knowledge of equilibrium (according to that French Guy's Principle, I forget his name lol), this will shift the equilibrium to the left, thus lowering the E value of the cell. so it wil 0.8->0.34=>0.46. As we can see, the EMF of the cell decreases.

The Golden Girl =D:

--- Quote from: Amelia on January 22, 2011, 03:51:29 pm ---According to the 2011 syllabus, you only need to know about the Optical Isomers.

Optical Isomers
When drawing a pair of optical isomers, candidates should indicate the three-dimensional structures
according to the convention used in the example below.
mirror plane


--- End quote ---

i ain't a CIE Student but can you tell me how to distinguish between Optical Isomers  :-\

EDIT

Thanks =D  

dlehddud:
They are organic molecules with four different groups attached to the central 'chiral' carbon atom. As you can see in the diagram, the central carbon is attached to a methyl, carboxylic acid, amino group and a hydrogen atom. You are never asked to distinguish which optical isomer rotates light in which direction (optical isomers can alter the plane of light), only to draw the two optical isomers. When in a question, if you're asked to identify a optical isomer or a chiral carbon, just look at a carbon atom that's attached to four different groups. Hope that helped :P

The Golden Girl =D:
dlehddud : Thanks mate =D  You helped me get the lesson =D

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