Pharaoh’s Snake Mercury(II) thiocyanate Hg(SCN)2) is an inorganic chemical compound, the salt of Hg2+ and the thiocyanate anion. 2 HSCN + HgO → Hg(SCN)2 + H2O (Berzelius) Hg(NO3)2 (aq) + 2 KSCN (aq) → Hg(SCN)2 (s) + 2KNO3 (aq) (Wöhler) When the compound is in the presence of a strong heat source, a rapid exothermic reaction is started which produces a large mass of coiling serpent-like solid. a firework product called "Pharaoschlangen" was available to the public in Germany. A similar. . effect to the Pharaoh's serpent can be achieved using a firework known as a black snake. These are generally benign products. but was eventually banned when the toxic properties of the product were discovered through the death of several children mistakenly eating the resulting solid. though less extreme. usually consisting of sodium bicarbonate or a mixture of linseed oil and naphthalenes.Pharaoh’s Snake For some time. 1 ± 3 kcal/mol) . Ammonium dichromate is sometimes known as ”Vesuvian Fire”. which initiates the following exothermic conversion: (NH4)2Cr2O7 (s) → Cr2O3 (s) + N2 (g) + 4 H2O (g) (ΔH=−429.Cool Chemical Volcano Ammonium dichromate is the inorganic compound with the formula (NH4)2Cr2O7. The volcano demonstration involves igniting a pile of the salt. chrome alum. It is also used as a mordant for dyeing pigments.Cool Chemical Volcano It has been used in pyrotechnics and in the early days of photography as well as in lithography. and as a catalyst. leather tanning and oil purification. Photosensitive films containing PVA. as a source of pure nitrogen in the laboratory. in the manufacturing of alizarin. and a phosphor are spin-coated as aqueous slurries in the production of the phosphor raster of television screens and other devices. . ammonium dichromate. KI is a component in some disinfectants and hair treatment hair chemicals. . an application that takes advantage of collision quenching of fluorescent substances by the iodide ion. Used as a fluorescence quenching agent in biomedical research.Orange Tornado KI is a precursor to silver iodide (AgI) an important chemical in photography. . The major uses of KI include use as a nutritional supplement in animal feeds and also the human diet. Used for radiation protection.Orange Tornado Potassium iodide is a component in the electrolyte of dye sensitized solar cells (DSSC) along with iodine. Used Treatment for some diseases.