"A song of dry ice and hydrogen fire" experiment
How do dry ice and hydrogen fire sound
Can chemical substances sing? In this entertaining experiment we will show you that chemistry is not just a beautiful science, but also a musical one!
Conduct the experiment in a well-ventilated room. Wear protective gloves and glasses. Don’t pick up dry ice with your bare hands–it can cause the tissues to freeze. Observe safety rules when working with fire and flammable substances.
*Reagents and equipment:
- metallic zinc;
- 15% hydrochloric acid;
- dry ice (solid carbon dioxide);
- flask with gas pipe with a fine nozzle;
- cloth napkin;
- metal spoon;
- glass cylinder/pipe.
Sprinkle zinc into the flask, pour hydrochloric acid and seal with a cork with a gas pipe with a fine nozzle. After a few minutes ignite the gas that comes out of the pipe – observe its barely noticeable flame. Take a glass pipe and pass it vertically over the flame – an unusual sound is produced.
Place a few pieces of dry ice on the cloth napkin and touch them with the metal spoon. There is a hissing sound.
In the interaction of zinc and hydrochloric acid a colorless combustible gas is released–hydrogen. When we run a glass tube over the flame, it heats the air inside it. Waves of hot air collide with the walls of the cylinder, and a howling sound is created. The higher the flame is located in the cylinder, the higher the pitch. Hydrogen burns with a colorless flame, and water is formed, which settles on the walls of the cylinder and weakens the sound:
2Н₂ + О₂ = 2Н₂О
If you touch dry ice with a metal spoon, you can hear a squeaking noise. This is caused by the micro vibrations that form in the sublimation of dry ice, i.e. when it moves from a solid state to a gaseous state.