[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.26,0:00:01.40,Default,,0000,0000,0000,,- [Instructor] In a previous video,
Dialogue: 0,0:00:01.40,0:00:04.00,Default,,0000,0000,0000,,we used a particulate model like this
Dialogue: 0,0:00:04.00,0:00:05.31,Default,,0000,0000,0000,,to understand a reaction,
Dialogue: 0,0:00:05.31,0:00:07.48,Default,,0000,0000,0000,,not just to understand the reaction,
Dialogue: 0,0:00:08.49,0:00:11.12,Default,,0000,0000,0000,,but to balance the\Nchemical reaction as well.
Dialogue: 0,0:00:11.12,0:00:14.39,Default,,0000,0000,0000,,And when I hand drew these particles,
Dialogue: 0,0:00:14.39,0:00:17.30,Default,,0000,0000,0000,,the atoms in this particulate model here,
Dialogue: 0,0:00:17.30,0:00:19.19,Default,,0000,0000,0000,,I tried to draw it pretty close
Dialogue: 0,0:00:19.19,0:00:21.62,Default,,0000,0000,0000,,to their actual relative sizes.
Dialogue: 0,0:00:21.62,0:00:24.14,Default,,0000,0000,0000,,Carbon atoms are a little\Nbit bigger than oxygen atoms,
Dialogue: 0,0:00:24.14,0:00:27.22,Default,,0000,0000,0000,,and they're both a lot\Nbigger than hydrogen atoms.
Dialogue: 0,0:00:27.22,0:00:28.36,Default,,0000,0000,0000,,What we're gonna do in this video
Dialogue: 0,0:00:28.36,0:00:32.19,Default,,0000,0000,0000,,is extend our understanding\Nusing a particulate model
Dialogue: 0,0:00:32.19,0:00:35.00,Default,,0000,0000,0000,,to start to visualize\Nwhat actually might go on
Dialogue: 0,0:00:35.00,0:00:36.22,Default,,0000,0000,0000,,in a mixture
Dialogue: 0,0:00:36.22,0:00:40.86,Default,,0000,0000,0000,,of some of these reactant molecules.
Dialogue: 0,0:00:40.86,0:00:43.32,Default,,0000,0000,0000,,So what I have here on the left-hand side
Dialogue: 0,0:00:43.32,0:00:45.12,Default,,0000,0000,0000,,are the various molecules.
Dialogue: 0,0:00:45.12,0:00:47.53,Default,,0000,0000,0000,,I have two methane molecules here.
Dialogue: 0,0:00:47.53,0:00:49.50,Default,,0000,0000,0000,,I have three water molecules.
Dialogue: 0,0:00:49.50,0:00:51.67,Default,,0000,0000,0000,,And what I wanna do with you
Dialogue: 0,0:00:51.67,0:00:56.36,Default,,0000,0000,0000,,is draw what we would expect\Nto see after the reaction.
Dialogue: 0,0:00:56.36,0:00:58.79,Default,,0000,0000,0000,,And I encourage you, like\Nalways, pause this video
Dialogue: 0,0:00:58.79,0:01:00.19,Default,,0000,0000,0000,,and see if you can have a go at that,
Dialogue: 0,0:01:00.19,0:01:01.20,Default,,0000,0000,0000,,maybe with a pencil and paper,
Dialogue: 0,0:01:01.20,0:01:03.21,Default,,0000,0000,0000,,at least just try to\Nimagine it in your head,
Dialogue: 0,0:01:03.21,0:01:04.69,Default,,0000,0000,0000,,before I do this with you.
Dialogue: 0,0:01:05.55,0:01:07.70,Default,,0000,0000,0000,,All right, now, let's do this together.
Dialogue: 0,0:01:07.70,0:01:11.41,Default,,0000,0000,0000,,Now, we know that for every\Nmethane and every water,
Dialogue: 0,0:01:11.41,0:01:15.06,Default,,0000,0000,0000,,we're going to produce one carbon monoxide
Dialogue: 0,0:01:15.06,0:01:17.61,Default,,0000,0000,0000,,and three molecular hydrogens.
Dialogue: 0,0:01:17.61,0:01:19.47,Default,,0000,0000,0000,,And each of those molecules of hydrogen
Dialogue: 0,0:01:19.47,0:01:21.28,Default,,0000,0000,0000,,have two hydrogens in them.
Dialogue: 0,0:01:21.28,0:01:26.28,Default,,0000,0000,0000,,So let's just say that this\None and this one react.
Dialogue: 0,0:01:26.32,0:01:28.98,Default,,0000,0000,0000,,They're going to produce\None carbon monoxide.
Dialogue: 0,0:01:28.98,0:01:31.66,Default,,0000,0000,0000,,I'm gonna try to draw the\Nrelative sizes roughly, right?
Dialogue: 0,0:01:31.66,0:01:35.15,Default,,0000,0000,0000,,So one carbon monoxide.
Dialogue: 0,0:01:35.15,0:01:38.77,Default,,0000,0000,0000,,And then they're gonna\Nproduce six hydrogen atoms
Dialogue: 0,0:01:38.77,0:01:41.53,Default,,0000,0000,0000,,that are going to be in\Nthree hydrogen molecules.
Dialogue: 0,0:01:41.53,0:01:43.20,Default,,0000,0000,0000,,So let's do,
Dialogue: 0,0:01:43.20,0:01:47.70,Default,,0000,0000,0000,,that's two and four,
Dialogue: 0,0:01:47.70,0:01:50.02,Default,,0000,0000,0000,,and then I'll just do one here
Dialogue: 0,0:01:50.02,0:01:53.27,Default,,0000,0000,0000,,and then six.
Dialogue: 0,0:01:53.27,0:01:56.37,Default,,0000,0000,0000,,All right, so I took care\Nof this one and this one.
Dialogue: 0,0:01:56.37,0:02:00.70,Default,,0000,0000,0000,,And now we can imagine that\Nmaybe this water molecule
Dialogue: 0,0:02:00.70,0:02:03.40,Default,,0000,0000,0000,,reacts with this methane molecule,
Dialogue: 0,0:02:03.40,0:02:07.08,Default,,0000,0000,0000,,and so that would produce\Nanother carbon monoxide.
Dialogue: 0,0:02:07.08,0:02:08.28,Default,,0000,0000,0000,,Let me draw that
Dialogue: 0,0:02:08.28,0:02:09.80,Default,,0000,0000,0000,,roughly at the right size.
Dialogue: 0,0:02:09.80,0:02:14.03,Default,,0000,0000,0000,,Another carbon monoxide molecule
Dialogue: 0,0:02:15.66,0:02:19.34,Default,,0000,0000,0000,,and three more hydrogen molecules
Dialogue: 0,0:02:19.34,0:02:21.13,Default,,0000,0000,0000,,for a total of six more hydrogens.
Dialogue: 0,0:02:21.13,0:02:25.74,Default,,0000,0000,0000,,So that's one and two
Dialogue: 0,0:02:26.77,0:02:28.83,Default,,0000,0000,0000,,and three.
Dialogue: 0,0:02:28.83,0:02:31.81,Default,,0000,0000,0000,,And now we have this water right over here
Dialogue: 0,0:02:31.81,0:02:34.56,Default,,0000,0000,0000,,that had no one to react\Nwith in this situation,
Dialogue: 0,0:02:34.56,0:02:35.85,Default,,0000,0000,0000,,had no partner.
Dialogue: 0,0:02:35.85,0:02:40.10,Default,,0000,0000,0000,,And so that's just going to be\Na leftover reactant molecule.
Dialogue: 0,0:02:40.10,0:02:42.22,Default,,0000,0000,0000,,So let me just draw it right over here.
Dialogue: 0,0:02:42.22,0:02:45.88,Default,,0000,0000,0000,,So that water could be
Dialogue: 0,0:02:45.88,0:02:49.83,Default,,0000,0000,0000,,right over right over here.
Dialogue: 0,0:02:49.83,0:02:51.66,Default,,0000,0000,0000,,And so this was a useful way
Dialogue: 0,0:02:51.66,0:02:53.88,Default,,0000,0000,0000,,of starting to visualize\Nwhat might be going on.
Dialogue: 0,0:02:53.88,0:02:55.61,Default,,0000,0000,0000,,Remember, this is happening\Nat a very high temperature.
Dialogue: 0,0:02:55.61,0:02:58.06,Default,,0000,0000,0000,,They're all bouncing around, et cetera.
Dialogue: 0,0:02:58.06,0:03:00.22,Default,,0000,0000,0000,,And then when they react,\Nyou might get this,
Dialogue: 0,0:03:00.22,0:03:02.64,Default,,0000,0000,0000,,but then this water molecule\Nhas no one to react to,
Dialogue: 0,0:03:02.64,0:03:05.84,Default,,0000,0000,0000,,so it is, you could view it as a leftover
Dialogue: 0,0:03:05.84,0:03:07.45,Default,,0000,0000,0000,,after the reaction.