In this demonstration, yellow phosphorus is reacted with oxygen gas underwater. Due to its pyrophoric nature, it is dangerous to combust phosphorus in the open classroom. Here, the element is placed in a test tube filled with water which is then suspended in a flask containing warm water. The tube is sealed, and oxygen is bubbled in from a canister. Combustion products are routed into a separate flask containing water. The warm water bath melts the phosphorus and, as oxygen bubbles come in contact with it, the phosphorus bursts into a bright flash as it combusts. Video and editing by Dr. Chris Schrempp
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