00:01
Hello, so today we'll be looking at different compounds and deciding whether they're ionic or covalent.
00:09
So let's take a look first at methane, so carbon bonded to four hydrogens.
00:16
So let's take a look at the electronegativity chart.
00:20
So if we look at carbon, it has 2 .5 electronecativity.
00:26
If we look at hydrogen, it's 2 .4, i mean 2 .1.
00:33
So the difference is 0 .4, which isn't that much.
00:38
So methane would be covalent.
00:42
The difference in electronegativity isn't enough for it to be ionic.
00:49
In order to be ionic, it has to be greater than 2.
00:52
So this is covalent.
00:53
We would draw it as, we would simply draw it as a carbon bonded to for hydrogens like this.
01:10
Now let's take a look at potassium fluoride.
01:15
So potassium is an alkaline, alkaline metal, has a 0 .8 electronegativity, which is quite low.
01:24
Fluorine has a very high electronegativity, it's 4 .0.
01:28
The difference between those is very high.
01:32
It's 3 .2, which is a lot greater than 1.
01:37
So this is definitely ionic...