deciding b/w polar and non-polar !!!

[hassam]

(a) how to decide whether a covalent bond is polar or non-polar?

(b) in AlCl3(aluminium chloride) isnt the bonding shud be polar covalent rather than non polar....plx clarify these confusions


thankoOo

 

[Xenon]

(i) A bond is polar when one of the atoms is of greater electronegativity than the other atom. This difference will cause one atom to gain a positive charge and the other negative charge. A bond will be non-polar if the difference in electronegativity is small(e.g C--H), if the bond is formed between identical atoms, (e.g. iodine molecule).

(ii) A molecule is polarised if:
---- its bonds are polarised
---- the molecule is not symmetrical

The geometry of AlCl3 is trigonal planar with a symmetric charge distribution. Therefore this molecule is non-polar.

Hopes this clears up

 

[hassam]

thnx bt cudnt get the trigonal planar thing

 

[XPFMember]

If u have studied the shapes of molecules then u will understand Have u studied them??

 

[hassam]

yea u r ryt.....