00:01
To write the chemical formulas from the name, we simply need to know the charges on the cation and the anion.
00:08
For the first one, the roman numeral tells us that the charge is 2 plus.
00:12
We recall that bromide is 1 minus, so we need two bromides for every one copper, c -u -b -r -2.
00:19
Silver just has a plus -1 charge, nitrate.
00:22
We have memorized it has a 1 -1 -ch charge, therefore we need one of each of them, ag -n -o -3.
00:28
Potassium has a 2 -plus charge because it's in group 1a, hydroxide, we've memorized as a 1 minus charge, so we need one of each of them, k -o -h...