00:01
So when we talk about chemical compounds, there's quite a few different ways to represent these, all right? and there are a lot of examples shown in the book.
00:10
This question asks, why are there so many? now, the reason there are so many is that all of these different forms of representation have a special place in chemistry.
00:22
So, for example, if we look at something like a formula, okay? let's use water as an example, just h2o.
00:32
The formula has some useful information, right? it tells us the elements present.
00:44
It also tells us how many, right? so we can see that there are two hydrogens for every one oxygen.
00:54
Okay.
00:55
Another nice thing about these formulas is that they're very short.
00:58
It's very quick to write down h2o.
01:02
And they're also very useful for balancing equations, right? so when we do a chemical reaction and we want to balance the stoichiometry, we want to make sure that we have the right amounts of everything present, chemical formulas are very good for that, okay, because we can see how many of each element is present.
01:23
It's just sort of like doing math with different variables, okay? we also have sort of words or systematic names.
01:33
So for example, water would just be the word.
01:37
The systematic name for this compound would be dihydrogen monoxide.
01:47
Now, this also has a place in communication, right? so this is much more useful for speech, right? so when you're actually talking about chemical compounds, it's a lot easier to use names like water or dihydrogen monoxide or sodium chloride than trying to just use formulas.
02:11
So these are very good for talking about chemistry.
02:14
Okay.
02:16
We can also draw chemical compounds in a variety of ways.
02:21
So one of those is lewis structures...