]> A chemical process is a method or means of somehow changing one or more chemicals or chemical compounds. [Wikipedia] Dissolution or solvation is the process of dissolving a solid substance into a solvent to yield a solution. [Wikipedia] In chemistry, neutralization is a chemical reaction (also called a water forming reaction since a water molecule is formed during the process) in which an acid and a base or alkali (soluble base) react to produce salt and water (H2O). During the process, hydrogen ions H+ (a bare proton) from the acid (proton donor) or a hydronium ion H3O+ and hydroxide ions OH_ or oxide ions O2_ from the base (proton acceptor) react together to form a water molecule H2O. [Wikipedia] Reaction of a substance with oxygen or incorporation of oxygen into a molecule. Photodissociation, photolysis, or photodecomposition is a chemical reaction in which a chemical compound is broken down by photons. It is defined as the interaction of one or more photons with one target molecule. [Wikipedia] The phase transition of a substance passing from the liquid to the solid state; solidification; the opposite of fusion. Ionization is the physical process of converting an atom or molecule into an ion by changing the difference between the number of protons and electrons. This process works slightly differently depending on whether an ion with a positive or a negative electric charge is being produced. A positive electric charge is produced when an electron bond to an atom or molecule absorbs enough energy from an external source to escape from the electric potential barrier that originally confined it, where the amount of energy required is called the Ionization potential. A negative electric charge is produced when a free electron collides with an atom and is subsequently caught inside the electric potential barrier, releasing any excess energy. change of state by state variable change State Change The physical process by which a liquid is transformed to the gaseous state; the opposite of condensation.