00:01
Okay, so we're going to try to assign oxidation numbers, and they're suggesting that we look at the ions.
00:05
Sometimes we can get a little overwhelming when there's so much going on, so it can help to write the two ions that you're working with.
00:17
And then in those ions, you can assign the oxidation number, right? so each one of these is plus one.
00:25
And since oxygen is minus two, the whole thing has to equal minus one.
00:30
This is plus five.
00:31
So it's a little easier to sometimes assign oxidation numbers if you break them into their ions and treat them separately.
00:40
You don't necessarily have to, but if it gets a little overwhelming, it's a good skill to learn.
00:47
So, cr3 plus and s .o4, 2 minus.
00:53
Obviously, this is plus 3...