00:03
Hi there.
00:03
In this question, we are given a molecule of theobroming, and what we're asked to do is a few different things.
00:12
The first one wants to know how many polar bonds are present in the molecule that we see there.
00:18
Well, carbon -to -carbon bonds, since they're going to be sharing equally, are non -polar.
00:27
Another type of bond we see in this molecule is carbon -to -hydrogen.
00:32
Those will also be non -polar.
00:35
Polar because the difference in electronegativity is 0 .4.
00:39
So the difference is so low that they are considered to be sharing equally.
00:44
However, the nitrogen to carbon bonds are going to be considered polar.
00:53
It would be classified as polar because nitrogen is 3 .0 and carbon is 2 .5 giving us a 0 .5 difference.
01:01
So every nitrogen to carbon bond is polar and every nitrogen to carbon bond is polar and every nitrogen to hydrogen bond is also going to be polar.
01:13
The difference there being 0 .9.
01:16
Also, the oxygen to carbon bonds will be polar because oxygen is 3 .5, whereas carbon has an electronegativity of 2 .5, giving us a difference of 1.
01:30
All right, so those would be the polar bonds that we see in this molecule.
01:37
So let's see if we can count up how many there are.
01:40
So looking at this molecule, we have a nitrogen that is bonded to a carbon, bonded to a carbon, bonded to a hydrogen.
01:53
We also have a nitrogen down here that is bonded to a carbon, bonded to a carbon, and bonded to a carbon.
02:05
Similarly, we have a nitrogen over here, and it is bonded to a carbon, and then double bonded to another carbon.
02:14
We have a nitrogen here, which is bonded to a carbon and bonded to another carbon.
02:23
Let's see what else we're missing here.
02:25
Those are all the nitrogen.
02:26
There's one, two, three, four nitrogen.
02:28
So we have all of the nitrogens and they're respective.
02:31
I'm missing one nitrogen to carbon bond here.
02:34
All right.
02:35
And then on this carbon up here, we have an oxygen.
02:40
And on this carbon here, we have an oxygen.
02:43
Okay, so let's count up the nitrogen to carbon bonds.
02:48
Well, nitrogen to carbon.
02:50
There's one, two, three, four, five, six, seven, eight, nine, ten.
03:03
Looks like ten nitrogen to carbon bonds.
03:07
All right, the nitrogen to hydrogen bonds...