00:01
In this problem, we're us to use the activity table or the activity series to predict whether a reaction will happen or won't happen.
00:09
So, for instance, let's say that we have water plus solid barium, so metallic barium, and we want to ask, do we have a reaction? and if so, what are the products? well, we know looking at the activity series, barium will react with h2o.
00:29
In fact, it tells us that the barium will sort of replace one of the hydrogens.
00:35
So the way to think about that is that if you replace one of the hydrogens with the barium, what you actually end up getting is barium hydroxide, right? so you've replaced one of the hydrogens.
00:46
But remember, you have to do the balancing of the charges, because barium is a plus two, i need two hydroxides.
00:52
So that's going to be solid barium hydroxide plus hydrogen gas.
00:57
Because the hydrogen has to go somewhere, and the most stable form for just h, all by itself, is going to be hydrogen gas.
01:07
So now we just have to balance this.
01:10
Notice that the bariums are already balanced.
01:14
The oxygens are not quite balanced, though.
01:18
Neither are the hydrogens, and we can fix both of those by adding a two coefficient out front of the water.
01:23
That should fix everything up...