00:01
For part a, we have calcium carbide.
00:04
The chemical formula is provided.
00:07
Reacting with water, which you should know is h2o.
00:11
Forming aqueous calcium hydroxide.
00:15
Remember, calcium has a 2 plus charge.
00:17
Hydroxide has a 1 -minus charge, so we'll need two hydroxides for every calcium.
00:22
And the final product is acetylene.
00:24
The chemical formula provided is c2h2.
00:28
So let's start by balancing the oxygen.
00:33
We have two oxygens here.
00:36
We have one oxygen here.
00:38
So we'll put a two there.
00:40
That then gives us four hydrogens.
00:43
Now the hydrogens are also balanced.
00:46
We have one calcium, one calcium, two carbons, two carbons.
00:49
And we're done.
00:52
The next one is potassium chlorate, or actually potassium, which is kcl3.
01:04
Perchlorate was the kcl4.
01:06
This is just potassium chlorate.
01:08
K c l .3, it will decompose into potassium chloride and oxygen.
01:22
Oxygen, remember, is o2.
01:25
Because we have an odd number of oxygens and an even number of oxygens, if we were to multiply this by two, we would now have an even number of oxygens on both sides.
01:36
That's going to require us to put a two here...