00:01
So we're going to go ahead and assign some oxidation numbers here.
00:04
So we're going to have on this page with us the rules for assigning oxidation numbers.
00:09
And we'll go ahead and refer to them as we go through the different examples.
00:13
The two elements you're often going to start with are oxygen or hydrogen because they have rules, right? oxygen and compounds is minus two, except the rare exception when you have a peroxide, which we'll actually see in a second.
00:27
And for hydrogen, it's going to be plus one, except the wrong.
00:30
Rare exception for hydrides.
00:33
Hydrides are easy to identify because you will have a metal and hydrogen.
00:40
So let's start with our first one.
00:43
C .l.
00:43
03 or 1 minus.
00:45
So the oxygen is minus 2.
00:48
So we'll go ahead and put a minus 2 there.
00:50
We write our oxidation numbers on the top.
00:53
And below we're going to keep track of some math.
00:56
So i have three oxygens and they're each minus 2, so i have a total of minus 6.
01:01
For ions, the oxidation numbers add up to the ions charge.
01:06
So this whole thing is going to have to add up to minus 1.
01:09
So i need a plus 5.
01:12
Therefore, chlorine has a plus 5 oxidation number...