00:01
So this question starts by stating that when water boils, bubbles form at the base of the container.
00:08
Then it proceeds to ask about the identity of the gas that has formed at the bottom.
00:13
So ignore the graph to the right for now.
00:16
We will use that later in the explanation.
00:19
But for now we have, just to see what they're talking about, a pot.
00:24
We have some fire that's heating it up, and there's some water inside.
00:29
So before the water starts getting to a rolling boil, i'm sure we've all seen water boiled before, these bubbles start forming at the bottom.
00:38
Then those bubbles start moving up, moving up, and then the water starts actually boiling.
00:43
So the question's asking what these bubbles are.
00:47
So what type of gas is being formed in those bubbles at the bottom of the water? so to just go further into explaining this, we want to look at a diet.
01:00
That goes through the phases of a certain molecule, which in this case is water.
01:07
So the temperature increases on the y -axis.
01:10
And as temperature increases, we have different phase changes.
01:13
So here we have a solid.
01:15
In the middle we have a liquid.
01:17
And at the end, we have a gas at the hottest temperatures.
01:21
So we know what temperature this happens with at water, right? so here we have zero degrees celsius to go from a solid to a liquid, right? so ice forms at zero degrees celsius...