Pick up some extra Mentos and Diet Coke, since your kids will want to do it again and again. Step 2: Roll the paper into a tube around a pack of Mentos mints, tape it into place and pull it off of the roll of mints.
Step 3: Hold your finger over one end of the paper tube and have your child fill it up with Mentos mints. It will probably hold a pack and a half of mints. Check that the paper is unbent, so that the mints will easily fall from the end of the tube when you remove your finger.
Their surfactant properties then lower the surface tension of the Coke, which breaks apart the water molecules and, in doing so, allows carbon dioxide bubbles to form more readily. With this in mind, the chemicals in Mentos also serve as foaming agents by facilitating the rapid release of CO 2 gas. Various types of carbonated beverages react differently with Mentos: Seltzer water has the weakest reaction while, very specifically, Diet Cherry Dr.
Pepper has the strongest reaction. This was demonstrated in an experiment that tested 15 types of carbonated beverages with Mentos. Each bottle tested had a two-litre capacity, and eleven Mentos were introduced to each bottle.
A two-litre bottle has about 15 grams of dissolved carbon dioxide, which, under the right conditions, becomes 8 litres of carbon dioxide gas in just a few seconds. The types of solutes in the soda mixture also have effects on the height of the fountain.
An experiment on Seltzer water, adding various types of solutes, produced the following results:. This mixture was first formulated by an American pharmacist, John S. Pemberton , in — though it was originally marketed as a panacea for common ailments. The original ingredients of Coca-Cola contained cocaine from coca leaves and caffeine-rich extracts from kola nuts.
The warm one will release bubbles of CO 2 much faster, because a warm gas is more energetic. Whether the soda is warm or cold, the process of forming bubbles occurs slowly. However, if there are sharp edges or fine particles in the liquid, these have surfaces that allow the CO 2 molecules to start bubble formation more easily these are called nucleation points.
Mentos tablets contain thousands of these nucleation points and when dropped into Coke, they allow the bubbles to form almost instantaneously. To understand how the surface of the Mento causes the CO 2 bubbles to nucleate, think about how rock candy is made. A string or a stick is immersed into a supersaturated mixture of sugar and water, and crystals of sugar nucleate around the stick. Without immersing the stick, the crystals will grow eventually, but the stick speeds up the process by providing a surface for nucleation.
This pressure effect of gases and liquids also has a more dangerous aspect as well: when scuba divers go to great depths in the ocean, they are breathing air, or specialized gas mixtures, at four or more times atmospheric pressure.
Because of this, nitrogen dissolves into their blood stream in much higher amounts than would happen at the ocean surface. The bubbles in a bottle of soda are caused by molecules of dissolved carbon dioxide. Generally, water molecules like to stay next to each other, which prevents any dissolved gases from collecting.
However, when offered a surface, called a nucleation site, dissolved gases such as carbon dioxide can gather, eventually forming a bubble. The sides of a bottle serve this purpose. When the bubble gets big enough, it breaks surface tension with the side of the bottle and floats up.
A bottle of soda that gets shaken up releases the gas bubbles into the solution, making the soda supersaturated with carbon dioxide. This causes the carbon dioxide to get released quicker when you open it, causing a foamy explosion.
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