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More wondrous nollidge, and all for you, you little nollidge muncher, you, so you can become a creator of worlds. Just tell 'em I helped, by making sure these precious tapes are archived forever, on the interworld of fascinating things. That is, until someone decides I've done a naughty and I'm obliged to take 'em down. Well, let's just hope that doesn't happen... Mange toot, the subtitles are all my own work. This time it's all about chemical reactions, and the three fundamental principles of chemistry - acids, alkalis and electrically charged ions in solution. This is actually two programmes: the first teaches about the basic concepts of atoms combining in ratios to form molecules - the Atomic Theory. The second part deals with how acids and alkalis work, simple tests for them and how they react with other substances as electrically charged ionic solutions. Skip forward to 11:22, if you want to see that bit. It starts with an interesting bit of history about how quicklime used to be made in lime kilns.