"Screaming Jelly Babies" (British English), also known as "Growling Gummy Bears" (American and Canadian English), is a classroom chemistry demonstration which is practiced in schools around the world.[1] It is often used at open evenings to show the more engaging and entertaining aspects of science in secondary education settings.[2][3]
The experiment shows the amount of energy there is in a piece of candy. Jelly babies[4] or gummy bears[5] are often used for theatrics. Potassium chlorate, a strong oxidising agent, rapidly oxidises the sugar in the candy causing it to burst into flames. The reaction produces a "screaming" sound as rapidly expanding gases are emitted from the test tube.[6] The aroma of caramel is given off.[7] Other carbohydrate or hydrocarbon containing substances can be dropped into test tubes of molten chlorate to produce similar results.[8][9]
Net Reaction
4 KClO3 (s) + C12H22O11 (s) + 6 O2(g) → 4 KCl + 12 CO2 (g) + 11 H2O (g)
^"Growling Gummy Bears". BYU Lecture Prep. Brigham Young University. 22 March 2014. Archived from the original on 19 October 2014. Retrieved 22 March 2014.
^"CHEMISTRY 11 DEMONSTRATIONS" (PDF). wikieducator.org. 22 July 2011. Archived from the original (PDF) on 22 July 2011. Retrieved 22 March 2014.
^"YouTube videos to ignite science". bbc.co.uk. 1 December 2008. Retrieved 14 May 2013.
^"Lubbock Christian University: Can a Gummy Bear Scream?". seatfansclub.com. 22 March 2014. Archived from the original on 22 March 2014. Retrieved 9 November 2020.
^"5.5 Oxidation of Sugar or Gummi Bear with Potassium Chlorate". Chemical Reactions II: Oxidation/Reduction. University of Massachusetts Lecture Demonstrations. 22 March 2014. Retrieved 22 March 2014.
^"Screaming Jelly Baby Experiment - Student Science". urn1350.net. 16 January 2012. Archived from the original on 22 July 2012. Retrieved 13 May 2013.
^"The screaming jelly baby" (PDF). Royal Society of Chemistry. 5 December 2023. Retrieved 5 December 2023.
^"Jelly Babies". youtube.com. 24 January 2012. Retrieved 18 November 2020.
^"The University of Nottingham's Periodic Table of Videos". youtube.com. 18 November 2020. Retrieved 18 November 2020.
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