Credit: NILERED/SCIENCE PHOTO LIBRARY

Caption: Mercury thiocyanate thermal decomposition. Sample of mercury (II) thiocyanate (Hg(SCN)2) forming snake-like structures during thermal decomposition, which is triggered by heat from a flame provided by the demonstrator. 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, chemical, chemist, chemistry, clip, demonstration, demonstrator, educational, entertainment, experiment, film, footage, growing, growth, heat, hg(scn)2, intumescent reaction, lab, laboratory, mercury (ii) thiocyanate, mercury thiocyanate, motion, one person, people, person, pharaoh's serpent, pharaohs serpent, reacting, school science, snake-like, swelling, thermal decomposition, toxic, video

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Mercury thiocyanate thermal decomposition

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Duration: 00:01:05

Frame size: 1920x1080

Frame rate: 25

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

File size: 1.3G

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Frame size: 3840x2160

Codec: H.264

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