The Hill system (or Hill notation) is a system of writing empirical chemical formulas, molecular chemical formulas and components of a condensed formula such that the number of carbon atoms in a molecule is indicated first, the number of hydrogen atoms next, and then the number of all other chemical elements subsequently, in alphabetical order of the chemical symbols.
Iodine clock reaction. The iodine clock reaction (STd3) is a classical chemical clock demonstration experiment to display chemical kinetics in action; it was discovered by Hans Heinrich Landolt in 1886. Two colourless solutions are mixed and at first there is no visible reaction.
Those salts dissolve into potassium or sodium ions and iodine ions. The iodine ion (I-) reacts with the free iodine (I 2) to form a triiodide ion (I 3-) which is soluble in water and can react with glucose chains. A solution of iodine and potassium iodine is also called Lugol's iodine and was one of the first uses of iodine as a disinfectant.