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3 Feb 2012 00:49:37 IST
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i hav juz strted studyin iit.... so have many doubts... whats the exact difference between polar and non polar compounds.... why is that H2O is polar and CO2 is non polar????
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3 Feb 2012 00:56:44 IST
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also y is H2O v-shaped??? And isnt it collinear???
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3 Feb 2012 16:13:46 IST
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well in H2O molecule the O is bonded with 2H atoms nd has 2 LP thus its hybridization is sp3 nd should be of tetrahedral shape but due the repulsion between the lp electrons nd the bonded electrons the angle differs nd so does the shape . Hence it appears to be v shaped.
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3 Feb 2012 16:18:28 IST
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polarity means seperation of charges. one is bond polarity nd d other being molecule polarity which is due to dipole moment . bond polarity is due to difference difference in EN nd dipole moment u can say the overall sum of all the bond polarities in a molecule ( just for understanding , not the authentic definition ) .... in H2O the polarity is towards O atom nd from structure u can get that the dipole moment is not 0 in H20 hence it is polar . but dipole moment is 0 in CO2 ( again refer to the structure ) hence it is non polar.
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3 Feb 2012 22:58:48 IST
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thanks alot..... so the structure of H2O is coplanar... rite??
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3 Feb 2012 23:02:06 IST
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No - NO its not coplanar......its hybridizaton is sp3 but it is distorted due to repulsion of lone pairs so the shape is bent ( we just call it bent ). Look every hybridization has its respective shapes ( which means shape when there is no lone pair in d compund) but when compounds have lone pairs the shape is not d same it is distorted due to repulsion .
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3 Feb 2012 23:14:08 IST
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kk.. still srry hav a doubt... a structure having 3 atoms shud be co planar.... as 3 points make a plane....
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4 Feb 2012 15:37:52 IST
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this is the mathematical perspective nd even if u consider that way u can't ignore the chemical phenomenons which is THE REPULSION OF LONE PAIR AND BOND PAIR ELECTRONS . thus ideally it should be plane nd it is like BF3 it is trigonal planar since der is no lone pair ...... nd hence ur point is justified but in d cases like that of H2O der we just can't ignore the repulsion nd hence the shape is not planar , it is bent .
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4 Feb 2012 19:33:10 IST
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kk thanks alot
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5 Feb 2012 15:06:27 IST
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I recently read that in BeCl2... Be has 4 electrons in its valance shell which is incomplete octet.... how is it possible... Be donates its 2 electrons and attains a duplet state right????
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6 Feb 2012 15:07:17 IST
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pls answer this question m not gettin it....
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6 Feb 2012 15:07:49 IST
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pls answer this question m not gettin it....
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6 Feb 2012 15:12:36 IST
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even if u consider mathematical aspect H2O can not be co planar since there are two bond pairs and two lone pairs that makes 4 species and not 3 so not coplanar..it is angular or bent
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6 Feb 2012 15:17:23 IST
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well the first thing is that H2O is not planar even if u consider it mathematically since there are four species or points there are two bond pairs and two lone pairs so they do not lie on a plane..the geometry is bent or angular or V shaped whatever u call it..
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6 Feb 2012 15:18:28 IST
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For BeCl2 it exists as dimer (BeCl2)2
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6 Feb 2012 15:18:44 IST
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or even polymer..
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8 Feb 2012 22:53:28 IST
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so in H2O do lone pairs also hybridise or they just act as hybridised orbitals???
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13 Feb 2012 21:14:10 IST
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so in H2O do lone pairs also hybridise or they just act as hybridised orbitals???
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13 Feb 2012 21:24:46 IST
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H20 has two lone pairs of electrons attached to the oxygen. This causes the O-H bonds to bend, causing the O to have a slightly negative change (due to the electrons) and the H's to have a slightly positive charge (due to the nature of H).
CO2 looks like O=C=O, where each oxygen is double bonded to the carbon and each O pulls electrons toward it equally. The center carbon has no lone electron pairs, so the electronegative pull from the oxygens cancels each other out, causing the overall dipole to become 0.
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13 Feb 2012 22:04:41 IST
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no lone pairs do not occupy hybrid orbitals...
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