00:01
For this problem, you're supposed to determine if the substance is polar or non -polar.
00:08
So to determine if it is polar or non -polar, you can remember snaps.
00:16
So symmetric will be non -polar, while asymmetric will end up being polar.
00:36
So that's a way to remember this.
00:37
Okay, so you've already determined that ccl4 is in fact non -polar, which is great, because we have carbon and we have four chlorine around it.
00:53
And when we draw this lewis structure, we realize that everything is symmetrical.
00:59
Therefore, they're going to cancel each other out.
01:02
Therefore, this is a polar molecule.
01:04
So good job there.
01:07
So nh3.
01:09
We have nitrogen, which has five electrons.
01:12
And we have hydrogen, which has one electron each, so three.
01:18
So we're working with eight total.
01:21
So we have one, two, three, four, five.
01:24
Remember, hydrogen needs one to be happy...