00:02
This question is a review of the difference between a mixture and a pure substance, and if it is a pure substance, being able to identify it as an element or a compound, and if it is a mixture, being able to identify it as a homogeneous or a heterogeneous mixture.
00:20
There are several pictures that are provided.
00:23
I will reproduce them here.
00:24
The first one looks something like this.
00:27
This one, each circle corresponds to an atom.
00:31
They're all the same color, so we will assume that they are all the same atom.
00:35
If they are all the same atom, then this is an element.
00:39
And an element, by definition, is a pure substance.
00:42
There are only two pure substances, elements and compounds.
00:49
For the next one, the picture looks something like this.
00:52
We have what appears to be molecules comprised of three atoms...