This impressive reaction is sometimes called, “The Barking Dog.” Watch the video and you’ll see why. It combines a very flammable chemical called Carbon Di-sulfate and the gas Nitrous Oxide. Nitrous Oxide is often used in race cars to give the car a sudden burst of oxygen energy. As the fire travels down the test tube it creates pressure which increases the energy released. After the reaction is over, you can see that the inside of the test tube is covered with a yellow-white sulfur powder left over from the carbon Di-sulfate.