00:01
Which of these hydrocarbons has a double bond in the skeleton? c3h8, c2h6, c2h2, or c2h4 or c2h2? okay, so we're going to draw these out, and when we do, we need to remember what we call the octet rule.
00:18
So the octet rule is that basically the atoms will attempt to have a full outer shell of electrons.
00:26
So bonds form to get a full outer shell of electrons.
00:35
How does this apply to hydrogen and carbon? well, hydrogen has one electron in its outer shell, so it will form one bond.
00:45
Carbon has four in its outer shell.
00:48
It will form four bonds.
00:51
So basically we're looking to draw this out so that every hydrogen has one bond, every carbon, has four bonds.
01:00
Okay, now let me start with a.
01:02
I'm going to draw three carbons, and now i'm going to give them eight hydrogens.
01:08
One, two, three, four, five, six, seven, eight.
01:16
Perfect.
01:18
So, if i draw it like this, okay, every hydrogen has one bond, every carbon has four, no double bonds.
01:29
So we can roll that one out.
01:31
Let me try the next one.
01:32
C2, h6.
01:35
This is going to go much the same way.
01:40
There we go.
01:43
C2, h6.
01:44
Again, all single ones.
01:46
Very good...