00:01
Is it true or false, but a polyunsaturated fat contains fatty acids of multiple double bond carbons? i'll start with the answer.
00:08
It is true.
00:10
So a fatty acid is a hydrocarbon chain.
00:14
So it looks a little bit like this.
00:17
All carbons.
00:18
I shall do those in a second.
00:20
And then at one end it has a carboxylic acid.
00:24
So this is the acid part of the fatty acid, and the rest is all carbons and hydrophins.
00:29
And it might be attached to something else over at the other end, like perhaps a glycerol molecule.
00:34
So this bit here is what makes a lipid, and also what stops it from being water soluble, because all of these carbon hydrogen bonds are non -polar.
00:45
So this part does not interact with water.
00:49
And what i'm doing here, filling in these hydrogens, is i'm making sure this obeys the octet rule.
00:55
So the octet rule is that atoms, are going to attempt to have a full outer shell of electrons.
01:06
And a full outer shell is 8, so they'll aim for 8 if they have quite a lot of electrons, or if they have very few, like sodium has only one electron in its outer shell.
01:17
Instead it will aim for 0, because then the next one is out of this ball.
01:21
So full or empty, either is acceptable.
01:24
So sodium, having one electron in its outer shell, will try to donate that electron.
01:29
Carbon has four electrons in this outer shell...