Credit: RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA/SCIENCE PHOTO LIBRARY

Caption: Mercury thiocyanate thermal decomposition. Footage of the snake-like growth of the structures formed during the thermal decomposition of a sample of mercury (II) thiocyanate (Hg(SCN)2). The heat is supplied by a blowtorch. This effect is sometimes known as 'Pharaoh's serpent', and was used for entertainment value in the 19th century before it was discovered that the compound is toxic. This type of reaction, where a substance swells on exposure to heat, is known as an intumescent reaction.

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Keywords: alive, blowtorch, chemical, chemistry, demonstration, educational, entertainment, growing, growth, heat, hg(scn)2, intumescent reaction, laboratory, mercury (ii) thiocyanate, mercury thiocyanate, pharaohs serpent, snake-like, swelling, thermal decomposition, toxic

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Mercury thiocyanate thermal decomposition

K004/7600 Rights Managed

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Duration: 00:02:23.09

Frame size: 1920x1080

Frame rate: 25

Audio: No

Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 2.4G

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Capture format: Sony FS700

Codec: H.264

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