Thermal Decomposition Reactions

This experiment demonstrates how the results of two reactions can create a colored flame with the sugar in the gummy bear. When potassium chlorate is heated to its molten state, it goes through a thermal decomposition reaction that causes it to dissociate into potassium chloride and excess oxygen. The gummy bear is mostly made up of sugar and causes a combustion reaction when mixed with the excess oxygen. Carbon dioxide and gaseous water are released as a result of the reaction. The purple flames that arise are the result of an exothermic reaction and heat being released is the result of an energy transformation. Although there are many chemistry concepts exhibited in this demonstration, I will only be explaining the science behind the thermal decomposition and combustion reactions. A thermal decomposition reaction is a type of reaction that causes the reactant to dissociate, or …show more content…
This website proves why the reactions need each other. “The heat produced continues to decompose the potassium chlorate resulting in a very rapid combustion reaction” (Chemical Reactions 2). In order for the combustion reaction to occur, the decomposition reaction needs to happen first in order to produce the heat and oxygen used in the next reaction. Because the reactions depend on each other, the two equations can be combined into one while still maintaining all the components: C6H12O6(s) + 8KClO3(s) = 12CO2(g) + 11H2O(g) + 8KCl(s). These reactions are simple and can be seen in your day-to-day life. Combustion reactions can be seen when you light a candle or build a fire. Decomposition reactions can be seen when carbonated drinks, such as soda, are left untouched and decompose into carbon dioxide and water. These basic reactions can be built up on and combined to create the more complex work we see in this