00:02
Hi there.
00:03
In this question, we are writing the formulas for ionic compounds.
00:10
And ionic compounds, as the name implies, are composed of ions.
00:15
Specifically, though, a cation, which is a positive ion, and an ion, which is a negative ion.
00:26
Furthermore, ionic compounds, even though they're composed of charged particles, they themselves are neutral.
00:33
And that that the total positive and negative charges have to add up to zero.
00:43
So we may need to add subscripts in our formulas so that the total charges add to zero.
00:51
All right, looks like we have three pairs here.
00:55
We have the chromium two ion with the chlorate ion.
01:07
We have the calcium ion with the chromate ion, and we have the potassium ion with the nitride ion.
01:30
Okay, it just took me a moment to recreate those, because we don't actually have the table.
01:33
We just have this in sentence form, so they're kind of running together.
01:37
But i think we have our positive and negative ions for each pair here.
01:41
So the first thing we need is the empirical formula, and then the name of the compound.
01:46
So in our first one, since the chromium has a 2 plus charge and the chlorate only has a single negative charge, we're going to need two of our chlorates because 2 times 1 negative is 2 negative.
02:01
Making our completed formula, cr, we need the cl03 in parentheses because we need to put that 2 outside of the parentheses.
02:13
And this is going to be chromium 2, since it is a transition metal and can have more than one oxidation state, we need to tell the reader which chromium we have...