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Iodine Clock Challenge

The blue color appears suddenly, like an alarm clock ringing. The challenge is to get the clock to ring in exactly 25 seconds! This video is part of the Flinn Scientific Best Practices for Teaching Chemistry Video Series, a collection of over 125 hours of free professional development training for chemistry teachers - http://elearning.flinnsci.com ATTENTION: This demonstration is intended for and should only be performed by certified science instructors in a safe laboratory/classroom setting. Be sure to subscribe and check out more videos! Subscribe: https://www.youtube.com/channel/Flinn... Facebook:   / flinnscientific   Website: https://www.flinnsci.com/