00:02
So for this question, you're asked to write the formula for each of the longhand written out molecular compounds.
00:16
So one thing to keep in mind when you are doing this, if there is no prefix or the prefix mono, right, no prefix or mono, it means there's going to be one of that atom.
00:31
If you have the prefix die, that means there's going to be two of the atom.
00:36
If you have the prefix tri, it means you're going to have three.
00:41
If you have the prefix tetra, that's going to tell you there's going to be four atoms in that molecule.
00:49
And then if you have the prefix penta or pent, you're going to have five.
00:57
And then if you have prefix hexa, you're going to have six.
01:05
So this will help us figure out the molecular formulas for them written out.
01:10
So let's just start with the first.
01:12
So we have carbon monoxide.
01:14
Carbon doesn't have a prefix, so we're just going to have one carbon.
01:17
And then monoxide, we have the prefix mono, which is one.
01:21
So we're going to have one oxygen.
01:24
Next, we have carbon dioxide.
01:27
Carbon doesn't have a prefix, so we just have carbon dioxide.
01:31
We have the dye, which is two, oxide, which is from oxygen.
01:35
So it means we have two oxygens.
01:38
So it would be co2.
01:40
Next we have dye nitrogen monoxide.
01:44
Di nitrogen.
01:44
Dai means two.
01:45
We have two nitrogens.
01:49
Monoxide.
01:49
Mono means one.
01:50
Oxide means oxygen.
01:52
So we have one oxygen.
01:53
So it would be n2o.
01:56
Next we have sulfur trioxide.
01:58
S doesn't have a prefix.
01:59
So we just write s for sulfur.
02:02
Tri oxide.
02:04
Try means three.
02:05
Oxide means there's three.
02:08
Oxygens.
02:09
So it would be s .o3.
02:11
Dynitrogen trioxide.
02:13
Dynitrogen, dye means two, which means two nitrogens.
02:18
Trioxide.
02:19
Try means three.
02:21
Oxide means oxygen.
02:23
So we have three oxygens.
02:25
So di -nitrogen trioxide is n203.
02:28
Next we have boron trihydride.
02:31
So there's no prefix for boron.
02:34
So we just write b for boron.
02:37
Trihydride.
02:38
Try means three.
02:39
Hydride means hydrogen.
02:41
So we're going to have three hydrogen.
02:44
So it'll be bh3.
02:47
Silicon tetrafluoride.
02:48
So there's no prefix for silicon.
02:50
So we're just right silicon.
02:53
The symbol for silicon, which is si.
02:55
Tetra fluoride.
02:56
So tetra means there's four.
02:59
Fluoride stands for fluorine.
03:01
So it means we have four fluorines.
03:04
So sif4.
03:05
Dion tetroxide.
03:08
So die means two.
03:09
So we have two nitrogens.
03:11
Tetroxide, right? tetra's four oxides, oxygen.
03:15
So di -nitrogen, tetroxide, the n204...