Screaming jelly babies

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Growling Gummy Bears
Jelly Babies Jelly babies.jpg
Jelly Babies

"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]

Contents

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)

Net Reaction of Oxidation of Sucrose and Potassium Chlorate.png

Mechanism [10]

The solid potassium chlorate is melted into a liquid.

KClO3 (s) + energy → K+ClO3-(l)

The liquid potassium chlorate decomposes into potassium perchlorate and potassium chloride.

4 KClO3 → KCl + 3 KClO4

The potassium perchlorate decomposes into potassium chloride and oxygen.

KClO4 → KCl + 2 O2

The sugar in the candy reacts with oxygen, forming water and carbon dioxide. The reaction is exothermic and produces heat, smoke, and fire.

C12H22O11 (s) + 12 O2 (g) → 12 CO2 (g) + 11 H2O (g) + energy

Safety Measures

Care should be taken in performing this experiment, which should only be attempted by a professional. Potassium chlorate is a strong oxidizer and can cause fire or explosions. It is toxic by inhalation or ingestion and is hazardous to aquatic environments. [11] Reagent grade potassium chlorate should be used. Upon completion of the demonstration, all chemicals should be disposed of in designated chemical waste containers to prevent harm to people or the environment. [7]

All participants in the experiment should wear personal protective equipment, including eye protection, and should stand a safe distance away from the demonstration. [12] A face-shield and heat resistant gloves should be worn by the person adding the jelly baby to the molten potassium chlorate. [12]

Variations

Deviation from the experiment is not recommended, and has been linked with accidents. [12] Candy with low moisture content or high surface area may cause explosions. [12]

Related Research Articles

<span class="mw-page-title-main">Oxidizing agent</span> Chemical compound used to oxidize another substance in a chemical reaction

An oxidizing agent is a substance in a redox chemical reaction that gains or "accepts"/"receives" an electron from a reducing agent. In other words, an oxidizer is any substance that oxidizes another substance. The oxidation state, which describes the degree of loss of electrons, of the oxidizer decreases while that of the reductant increases; this is expressed by saying that oxidizers "undergo reduction" and "are reduced" while reducers "undergo oxidation" and "are oxidized". Common oxidizing agents are oxygen, hydrogen peroxide, and the halogens.

<span class="mw-page-title-main">Potassium chlorate</span> Chemical compound

Potassium chlorate is a compound containing potassium, chlorine and oxygen, with the molecular formula KClO3. In its pure form, it is a white crystalline substance. After sodium chlorate, it is the second most common chlorate in industrial use. It is a strong oxidizing agent and its most important application is in safety matches. In other applications it is mostly obsolete and has been replaced by safer alternatives in recent decades. It has been used

<span class="mw-page-title-main">Potassium permanganate</span> Chemical compound

Potassium permanganate is an inorganic compound with the chemical formula KMnO4. It is a purplish-black crystalline salt, that dissolves in water as K+ and MnO
4
, an intensely pink to purple solution.

<span class="mw-page-title-main">Chlorate</span> Anion and term for chemical compounds containing it

Chlorate is the common name of the ClO
3
anion, whose chlorine atom is in the +5 oxidation state. The term can also refer to chemical compounds containing this anion, with chlorates being the salts of chloric acid. Other oxyanions of chlorine can be named "chlorate" followed by a Roman numeral in parentheses denoting the oxidation state of chlorine: e.g., the ClO
4
ion commonly called perchlorate can also be called chlorate(VII).

<span class="mw-page-title-main">Potassium perchlorate</span> Chemical compound

Potassium perchlorate is the inorganic salt with the chemical formula KClO4. Like other perchlorates, this salt is a strong oxidizer when the solid is heated at high temperature although it usually reacts very slowly in solution with reducing agents or organic substances. This colorless crystalline solid is a common oxidizer used in fireworks, ammunition percussion caps, explosive primers, and is used variously in propellants, flash compositions, stars, and sparklers. It has been used as a solid rocket propellant, although in that application it has mostly been replaced by the more performant ammonium perchlorate.

<span class="mw-page-title-main">Flash powder</span> Pyrotechnic mixture

Flash powder is a pyrotechnic composition, a mixture of oxidizer and metallic fuel, which burns quickly (deflagrates) and produces a loud noise regardless of confinement. It is widely used in theatrical pyrotechnics and fireworks and was once used for flashes in photography.

<span class="mw-page-title-main">Sodium chlorate</span> Chemical compound

Sodium chlorate is an inorganic compound with the chemical formula NaClO3. It is a white crystalline powder that is readily soluble in water. It is hygroscopic. It decomposes above 300 °C to release oxygen and leaves sodium chloride. Several hundred million tons are produced annually, mainly for applications in bleaching pulp to produce high brightness paper.

Chemical decomposition, or chemical breakdown, is the process or effect of simplifying a single chemical entity into two or more fragments. Chemical decomposition is usually regarded and defined as the exact opposite of chemical synthesis. In short, the chemical reaction in which two or more products are formed from a single reactant is called a decomposition reaction.

<span class="mw-page-title-main">Permanganate</span> Chemical compound

A permanganate is a chemical compound with the manganate(VII) ion, MnO
4
, the conjugate base of permanganic acid. Because the manganese atom has a +7 oxidation state, the permanganate(VII) ion is a strong oxidising agent. The ion is a transition metal ion with a tetrahedral structure. Permanganate solutions are purple in colour and are stable in neutral or slightly alkaline media. The exact chemical reaction depends on the carbon-containing reactants present and the oxidant used. For example, trichloroethane (C2H3Cl3) is oxidised by permanganate ions to form carbon dioxide (CO2), manganese dioxide (MnO2), hydrogen ions (H+), and chloride ions (Cl).

<span class="mw-page-title-main">Dichlorine heptoxide</span> Chemical compound

Dichlorine heptoxide is the chemical compound with the formula Cl2O7. This chlorine oxide is the anhydride of perchloric acid. It is produced by the careful distillation of perchloric acid in the presence of the dehydrating agent phosphorus pentoxide:

<span class="mw-page-title-main">Sodium perchlorate</span> Chemical compound

Sodium perchlorate is an inorganic compound with the chemical formula NaClO4. It consists of sodium cations Na+ and perchlorate anions ClO−4. It is a white crystalline, hygroscopic solid that is highly soluble in water and ethanol. It is usually encountered as sodium perchlorate monohydrate NaClO4·H2O. The compound is noteworthy as the most water-soluble of the common perchlorate salts.

<span class="mw-page-title-main">Lithium perchlorate</span> Chemical compound

Lithium perchlorate is the inorganic compound with the formula LiClO4. This white or colourless crystalline salt is noteworthy for its high solubility in many solvents. It exists both in anhydrous form and as a trihydrate.

A chemical oxygen generator is a device that releases oxygen via a chemical reaction. The oxygen source is usually an inorganic superoxide, chlorate, or perchlorate. Ozonides are a promising group of oxygen sources, as well. The generators are usually ignited by a firing pin, and the chemical reaction is usually exothermic, making the generator a potential fire hazard. Potassium superoxide was used as an oxygen source on early crewed missions of the Soviet space program, in submarines for use in emergency situations, for firefighters, and for mine rescue.

<span class="mw-page-title-main">Rubidium perchlorate</span> Chemical compound

Rubidium perchlorate, RbClO4, is the perchlorate of rubidium. It is an oxidizing agent, as are all perchlorates.

Explosophores are functional groups in organic chemistry that give organic compounds explosive properties.


Perchlorate reductase is an enzyme that catalyzes the chemical reactions:

<span class="mw-page-title-main">Glycerol and potassium permanganate</span>

The chemical redox reaction between potassium permanganate and glycerol is often used to demonstrate the powerful oxidizing property of potassium permanganate, especially in the presence of organic compounds such as glycerol. The exothermic (heat producing) reaction between potassium permanganate (KMnO4), a strong oxidizing agent, and glycerol (C3H5(OH)3), a readily oxidised organic substance, is an example of an experiment sometimes referred to as a "chemical volcano".

<span class="mw-page-title-main">Rubidium permanganate</span> Chemical compound

Rubidium permanganate is the permanganate salt of rubidium, with the chemical formula RbMnO
4
.

<span class="mw-page-title-main">Potassium chlorite</span> Chemical compound

Potassium chlorite is a potassium salt of chlorous acid (HClO2) having a chemical formula KClO2. It exists as white powder and its annhydrous form easily undergoes decomposition in presence of heat or radiation (especially gamma rays).

References

  1. "Growling Gummy Bears". BYU Lecture Prep. Brigham Young University. 22 March 2014. Archived from the original on 19 October 2014. Retrieved 22 March 2014.
  2. "CHEMISTRY 11 DEMONSTRATIONS" (PDF). wikieducator.org. 22 July 2011. Archived from the original (PDF) on 22 July 2011. Retrieved 22 March 2014.
  3. "YouTube videos to ignite science". bbc.co.uk. 1 December 2008. Retrieved 14 May 2013.
  4. "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. "5.5 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.
  6. "Screaming Jelly Baby Experiment - Student Science". urn1350.net. 16 January 2012. Archived from the original on 22 July 2012. Retrieved 13 May 2013.
  7. 1 2 "The screaming jelly baby" (PDF). Royal Society of Chemistry. 5 December 2023. Retrieved 5 December 2023.
  8. "Jelly Babies". youtube.com. 24 January 2012. Retrieved 18 November 2020.
  9. "The University of Nottingham's Periodic Table of Videos". youtube.com. 18 November 2020. Retrieved 18 November 2020.
  10. "Sharing chemistry with the community: "The Exploding Gummy Bear"". Chem 13 News Magazine. 25 August 2017. Retrieved 6 December 2023.
  11. "Potassium Chlorate Safety Data Sheet" (PDF). Fisher Scientific. 6 December 2023. Retrieved 6 December 2023.
  12. 1 2 3 4 "Screaming jelly baby – technician notes". Education in Chemistry. January 2021. Retrieved 6 December 2021.

Further reading