PROFESSOR: But we don't have that much time. So anyways, September 25, 5:00 p.m. Eastern Daylight Time. Submit your entry, whether it's the big canisters of the Hollywood footage or whether it's just a 14-line mnemonic device. And the prizes-- it's a contest, there are prizes-- I have ties and scarves from the American Chemical Society.
[LAUGHTER]
PROFESSOR: What are you laughing at? These things! Now look at me! This is going to be stylish. They're black. They've got elements from the Periodic Table on them. Very hot. Very hot. They're black. They look great. And we're going to present them on the Friday of the parents' weekend because the parents eat this stuff up.
So now I think it's time to get back to learning. So last day we ended with the stoichiometry, and I showed you the Kroll process, how to make titanium. So the question that we never got to was how do we tell that magnesium has a higher affinity for chlorine than titanium does? How do we know that magnesium is going to reduce titanium tetrachloride to a sponge? So for that we have to look inside the atom. We have to look inside the atom. So that's what we're going to start doing today. And we're going to begin, as often we will, with a history lesson.
So let's