When students enter the room, I ask them to get out something to write with, a calculator, and a periodic table. When everyone has finished the quiz, I ask students to share their molar mass values so students can all have the same starting information. I decided to utilize the demonstration referred to as the Screaming Gummy Bear or the Gummy Bear Sacrifice as a pretext for the calculations. I ask them to say goodbye to the evil little gummy bear witch, and go into the storeroom to heat the potassium chlorate. In chemistry terms, a violent reaction. The heat, evolved or required is the change in enthalpy.
Remember that energy, in an open system, can do work on the surroundings or supply heat to the surroundings. This is how you make an explosive device, Joe Bang style. Well, actually yes, but not like Joe Bang did it. I'm going to be perspiring. That heat and light energy? From then until the late 18th century, when sugar became mass produced, it was considered a luxury. Add a small bit of a gummy bear to the test tube and observe the reaction. The thermal decomposition of potassium chlorate produces potassium chloride and an excess of oxygen, which is sufficient to ignite the Gummi bear.
To initiate the reaction, carefully add a drop or two of to the powdered mixture. So all of this worked to produce potassium chlorate…kind of. Spills should be neutralized and wiped up. It emphasizes the importance of the difference in chemical properties of the anion suffix. Nothing happens, no reaction occurs.
The ionic attractions are far greater than the force of collisions between atoms and molecules at room temperature, so salts are typically solids. The heat released is roughly 32. So here are the reactants and here are the products. Now all combustion reactions have more energy stored in the reactants than the products, so as the reaction progresses, this energy has to go somewhere and it's released as heat and light. The boiling will take some time and release an appreciable amount of chlorine gas which is extremely dangerous and should never, ever be done in the house. Alternatively, perform this demonstration outdoors. Discussion: The thermal decomposition of potassium chlorate produces potassium chloride and an excess of oxygen, which is sufficient to ignite the Gummi bear.
Here's a simple fire chemistry demonstration that produces instant fire without using matches or any other type of flame. A small amount of sugar, a carbohydrate, reacts with an oxidizing agent to release a large amount of energy. We then take our mass of oxygen needed, and bring it to the potassium chlorate reaction. Have a fire extinguisher close at hand in case of fire. The following day, we complete our calculations. A similar demo can be done by blending sugar and potassium chlorate then using concentrated sulfuric acid to initiate the reaction.
Any interesting or relevant images or videos whether they be about the subreddit or a demonstration must be done in a self post. At room temperature and pressure, the salt exists as a solid. Sucrose is made up of glucose and fructose and is extracted from various plants including sugar cane and sugar beet. In the case of the gummy bear experiment, potassium chlorate decomposes and releases oxygen when heated. It looks like this minus the dorky music : In a science museum, this demonstration is usually performed as a way of showing just how much energy is in the food we eat.
Before passing out the quiz, I explain that there are four problems for them to set up and solve. And I want you to compare what you just saw. I show students the setup, and add in the amount of potassium chlorate they calculated. For example a post featuring a can being smashed or the motion of a pendulum will be removed. An organic carbon compound will combine with oxygen to give off carbon dioxide and water.
But energy need not stay in one place. John Dolhun is going to show us. It can be used as a propellant and as a source of heat to make colored fires. ? When we express energy as the sum of heat and work, we are making a very specific claim concerning these two properties. ? As it's being heated, the liquid potassium chlorate immediately starts breaking down into two products, potassium chloride and oxygen. When you are ready to start the reaction, it can be initiated by adding a couple of drops of to the contents of the test tube. The energy evolved as heat is calculated below: 2.
That's it for me today. Once the demonstration is done, we finish the class practicing our mass to mass problems with another problem set. This demonstration illustrates the amount of energy available in carbohydrates, such as sugar which is a major component of candy. Fictional portrayals of harmful science always have at least one of two barriers that prevent audience members from making anything dangerous: 1 the methods and materials needed are far out of the reach of a layperson; and 2 the steps in making the dangerous device or substance are jumbled, incomplete, or just screwed up. Our bodies expend about 1J of work with a single heartbeat. Place a small quantity of potassium chlorate in a test tube.
Neither you, nor the coeditors you shared it with will be able to recover it again. Once we clear up that issue, students can finish the last two problems. For more gummi bear destruction try , shortly after hatching, or with a laser. Avoid contact with flammable materials. These chemistry experiments are not only fun, but very educational for all of those interested in scientific chemical reactions and properties. However, when the salt is introduced to a polar solvent like water, the ions separate and the salt is soluble.