Caption: Demonstration of a Belousov-Zhabotinsky (BZ) reaction, in which bromate ions oxidise malonic acid to carbon dioxide. A solution containing bromate ions and malonic acid is mixed in a beaker using a magnetic spinner, with cerium (IV) ions as a catalyst. The reaction mixture oscillates in colour between red-brown and colourless with a time period of about 20 seconds, in two auto-catalytic processes. Bromate ions (colourless) are reduced to molecular bromine (red-brown), and then to bromide ions (colourless) in the presence of cerium ions, and malonic acid is oxidised to carbon dioxide and water. This reaction is an example of a class of reactions called Belousov-Zhabotinsky (BZ) reactions and is an example of non-equilibrium thermodynamics, and a non-linear chemical oscillator.

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Keywords: 20 seconds or greater, agent, auto-catalytic, beaker, belousov-zhabotinsky, bromate, bromide, bromine, brown, bz, carbon dioxide, catalysing, catalysis, catalyst, cerium, cerium iv, change, changing, chemical, chemistry, colour, colourless, demonstrating, demonstration, education, educational, effect, effects, experiment, experimental, ion, laboratory, magnetic, malonic acid, manganese, mixed, mixing, mixture, non-equilibrium thermodynamics, non-linear chemical oscillator, oscillate, oscillation, oscillator, oxidation, oxidising, oxidizing, reacting, reaction, red, science, solution, spinner

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Belousov-Zhabotinsky reaction

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