00:01
Hi.
00:02
So this question is asking you classify a bunch of substances, either elements or compounds.
00:07
And they have four substances here for you.
00:09
So let's just get started.
00:11
We have a, and they say it's hydrogen, right? hydrogen.
00:16
So basically, how do you know if something is an element or a compound? a good rule of thumb is if you can find it in your periodic table, it is an element.
00:26
If it's not, if it's a combination of those elements, then it's a compound.
00:29
So that's what a compound.
00:31
It's a combination of two or more elements.
00:33
An element is just one singular chemical species that can be found on the periodic table.
00:39
So back to the question, hydrogen, right? let's see.
00:43
Where can we find that on our periodic table if we can? as you can see, at element number one, it's hydrogen.
00:51
It's h.
00:52
Hydrogen.
00:52
So hydrogen is what an element then? right? it's just one singular chemical species.
01:01
Now let's look at b.
01:03
B is water.
01:05
Now, water.
01:06
What is the symbol for water? it is h2o, right? now, if you look at h2o, you can see that it's several elements within here...