After approximately 3 to 5 minutes, the sugar will turn black and the mixture will become very hot. A column of carbon will rise out of the beaker to a height of several inches. Sulfuric acid is ...

Pour a layer of concentrated sulfuric acid ½” to ¾” thick on top of the sugar ... enabling the students to watch the reaction without releasing the smoke into the room. After approximately 3 to 5 ...