The Briggs–Rauscher reaction is an oscillating reaction whose colourless solution slowly and periodically turns an amber colour, suddenly changing to a very dark blue [source, full video and explanation by MIT OpenCourseWare: buff.ly/3c0u5t0]
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That's pretty cool tho.... 🙋🏻♀️how and why does it change back and forth? And is the liquid spinning without being mixed? Is that a result of heat? Or just the video not showing it being mixed?
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If you do this in a empty petri dish, with small quantities of reagents, you can get little expanding rings of colour as the reaction propagates outwards from where you drop the activating chemical in. Shown for similar BZ reaction
GIF
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Which makes the color change from the colorless to the amber color and the dark blue ?. Is it changed by the chemical reaction or the reaction with the Oxygen ?.