Page 1 of 1

Polar and Non polar

Posted: Sun Nov 17, 2019 3:33 pm
by 405404782 Gabriel Rigole 4F
How can you if a molecule is polar or nonpolar?

Re: Polar and Non polar

Posted: Sun Nov 17, 2019 3:38 pm
by Trinity Vu 1D
You look for if the molecule can have dipole moments based on the difference of electronegativity between the two atoms. Electronegativity increases across and up the table. However, beware that a molecule can be overall non polar but still have polar bonds. This is because, for example, in a CO2 molecule each C-O bond is polar. However, using vector addition, the two dipole moments cancel each other out thus making CO2 non polar.

Re: Polar and Non polar

Posted: Sun Nov 17, 2019 3:50 pm
by Aliya Jain 2B
You can also use molecular geometry to find polarity. For example, lone pairs on oxygen in h2o cause there to be bent geometry, which thus indicates that the molecule is polar.