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.
Definition of 'acrosome reaction'. acrosome reaction (ËÃ¦krÉËsÉÊm rÉªËÃ¦kÊÉn) noun. physiology. the release of enzymes from the acrosome when a spermatozoon encounters the ovum, allowing fusion with the ovum in the sexual reproductive process. Useful links.