00:01
All right, so to be able to figure out which attractive forces are stronger, we're going to have to look at the kulombic attraction force.
00:09
The force of attraction is based on kulom's law, which has a constant times the charges of the two things over the distance, which is normally symbolized by r.
00:28
You might know it is d squared.
00:31
Now, k is a constant, so it's going to be the same for any of our calculations.
00:38
So when we're looking at this, we really don't care about k.
00:40
We look at the two charges and we look at the distance between them.
00:44
So let's look at nacl and c -a -o.
00:50
Now, when we look at charges, we're going to be looking at plus 1 minus 1, and we're going to be looking at plus 2 minus 2.
00:59
So when we're looking at the force of attraction for the nacl, it's going to be 1 times negative 1 in our numerator.
01:18
When we're looking at the force of attraction for calcium oxide, we have that same constant, but we have two times negative 2.
01:27
Now our negative here is going to show us that there's an attraction.
01:31
Okay? so so far, the sign, okay, it's really the magnitude we care about, not the sign.
01:42
The force of attraction for calcium oxide is four times as great right now...