Attention! Some experiments shown in this video are dangerous! Do not repeat experiments shown in this video! Hello everyone. Today we will conduct experiments with dry ice, or a solid phase of carbon dioxide. At first, we can look at how dry ice actually looks like. In our laboratory, it’s stored in these small cylinders. Dry ice can be taken with bare hands as long as you don’t squeeze it as you can get frostbite (which isn’t good for you). The temperature of dry ice is -79 degrees Celsius and it’s nothing more than a solid state of carbon dioxide. At atmospheric pressure dry ice may be in a solid or gaseous state. To be in a liquid state it need to be in a strong pressure. Dry ice sublimates being exposed to air, i.e. changes state from solid to gaseous without going through the liquid phase. If you put dry ice in water, it will begin to sublimate faster, especially if the water is hot. Also in this reaction a beautiful mist is formed. If you add a liquid soap in the water, it will form beautiful bubbles which can be taken with hands. Bubbles are filled with the said mist, it looks pretty impressive. When the bubbles burst, the mist comes out. All this looks like magic. However, this is just a physical phenomenon. We decided to play around a bit and took a large beaker with very hot water and poured there a little bit of dry ice. Instantly the dry ice began to transform into gaseous state and formed a nice thick fog. Now let’s look at a dry ice reaction with magnesium. We took a ceramic grid, and put a few pieces of dry ice on its surface. Then, we put a bit of magnesium turnings in the center of the resulting structure. Once we have such a construction, we ignite the magnesium.
Quite a vigorous reaction occurs, at which magnesium reacts with carbon dioxide to form magnesium oxide and coal. If we shove dry ice into the flame of a gas burner it still won’t melt but will simply sublimate faster. Also, let’s consider a very interesting property of dry ice. If you put a piece of it on a metal surface, it will jump and rattle. Since the metal surface is warm, then dry ice sublimates very quickly on it and forms focuses of high pressure. Also, there is an interesting effect where dry ice starts to slide on the metal surface due to sublimation. This effect is a reminiscent of air hockey. Additionally, dry ice has a musical property. If a piece of it touches a metal object you get a sound.
You can even compose some melody. Facebook: https://www.facebook.com/thoisoi2