![]() ![]() Why do you think all of this is important? Make sure that the bottle is on a level surface and stably standing straight. Place a Diet Coke bottle in an outdoor area, at least two meters from any buildings or anything hanging above the area, such as eaves, overhangs or wires.Wear clothes that you would not mind if they get splashed with a little soda pop-this activity can get a little messy!.Be sure to wear eye protection when putting the candies into the cola!.Make a Mentos cartridge to hold the candies for you before you drop them into the Diet Coke bottle by rolling an index card into a tube, slightly larger than the diameter of a Mentos candy.What does the inside of the candies look like? An adult may help you cut up the candies. On the wax paper, carefully use a knife to crush and cut four Mentos candies into many small pieces. Place a piece of wax paper on top of the cutting board.Video camera with either a tripod or a helper to take the images (optional).Eye protection (safety goggles or glasses).An outdoor area at least two meters from buildings.One roll of Mentos (at least eight candies). ![]() ![]() The speed at which the Mentos falls through the soda can affect how large the eruption is, and this can be tested by comparing whole with crushed Mentos, the latter of which are less dense. This rough surface allows the bonds between the carbon dioxide gas and the water to more easily break, helping to create carbon dioxide bubbles and cause the classic eruption. Although the candy may look smooth, if you looked at it under a microscope you'd see tiny bumps coating its entire surface. To create bubbles, the carbon dioxide needs to interact with itself, which means that the carbon dioxide's bonds with water in the Diet Coke must be broken. But all those gas bubbles want to escape, making it no wonder that soda makes you burp! When you pour some soda into a glass, some gas escapes and forms foam, but most stays trapped by the surface tension of the water. While the soda is in the bottle, the gas is kept in solution by the bottle's pressurized conditions. It also means changing some factors may cause a larger or smaller physical reaction to take place.Ī carbonated beverage is packed full of dissolved carbon dioxide gas, which forms bonds with water. That means that all of the pieces of the reaction are there, but that they are simply rearranged. But the amazing eruption that takes place when Mentos are dropped into Diet Coke or other brands of diet soda pop is not a chemical reaction at all! Instead it is a physical reaction. Have you ever seen the Diet Coke and Mentos experiment that is all over the Internet and wondered what makes the reaction work? You might think that there is some ingredient in a Mentos candy that causes a chemical reaction with the soda pop, like the way baking soda reacts with vinegar. ![]()
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