00:02
Hi there, in this question, we want to know which of these molecules are polar.
00:08
So to have a polar molecule, the molecule has to lack symmetry.
00:19
In other words, not be symmetrical.
00:23
So let's look at what we have here.
00:24
Our first one, pcl3.
00:27
We have phosphorus with a lone pair of electrons because it has five electrons total, and then the three chlorines.
00:36
So this shape is trigonal, pyramidal.
00:47
Intriginal parameter does not have symmetry.
00:52
So this would be a polar molecule.
00:57
It has a dipole moment.
01:00
All right, so this one is polar.
01:08
Let's go on because we want to select all of the ones that are polar.
01:12
So the next one, h2o, that's an easy one because we always talk about water being polar.
01:18
That's because it is a bent molecule.
01:22
So it does not have symmetry.
01:23
And therefore a polar molecule.
01:26
It has a dipole moment.
01:28
The hydrogen side of the molecule is slightly positive.
01:31
The oxygen side of the molecule is slightly negative.
01:35
All right, so that one's polar...