The team describe their favourite and most beautiful chemical reactions, again in response to a viewer question. More chemistry at http://www.periodicvideos.com/ Follow us on Facebook at http://www.facebook.com/periodicvideos And on Twitter at http://twitter.com/periodicvideos Extra info from this video: Barking Dog http://www.youtube.com/watch?v=mGMR72X8V-U Hydrogen http://www.youtube.com/watch?v=6rdmpx39PRk Chemical Garden http://www.youtube.com/watch?v=sAr7mvBjWq8 Coke cans http://www.youtube.com/watch?v=WnPrtYUKke8 CO2 http://www.youtube.com/watch?v=0dSMzg0UPPo Sam's CO2 mishap http://www.flickr.com/photos/periodicvideos/4253257615/