00:03
Hi there.
00:04
In this question, we are trying to determine if we have a chemical change or a physical change.
00:09
So to help us out, let's talk about a few of the indicators that typically tell us that we have a chemical change taking place.
00:19
And these are not absolute, but frequently they tell us that there's a chemical change happening.
00:25
The first one is a color change.
00:33
The next one is bubbling, but that doesn't mean boiling.
00:37
That just means you put mixed two things together and you see a.
00:40
Gas being given off.
00:42
Doesn't mean you're heating it up to boiling.
00:48
Okay, another one is a release or taking in energy.
00:56
So let's just say a change in energy.
01:03
Again, these are not always chemical changes.
01:06
For example, changes in state require changes in energy.
01:10
Like if something's melting, it has to take an energy to melt.
01:14
Right.
01:15
And the last one is formation of a precipitate.
01:28
And what a precipitate is, is it is a solid that is formed when two clear solutions are mixed together.
01:39
And it appears as tiny little particles of the solid.
01:47
Well, this sounds really familiar.
01:56
This sounds exactly like our question here.
02:02
It says that we have two beakers that contain clear colorous liquids, and we mix them together, and we get a white solid.
02:10
That white solid is a precipitate.
02:23
And this is one of those that pretty much always means a chemical change.
02:27
So also we saw a color change here because it went from colorless to white...