Dissociation in chemistry and biochemistry is a general process in which complexes, molecules, or salts separate or split into smaller molecules, ions, or radicals, usually in a reversible manner. Dissociation is the opposite of association and recombination. Chemistry (derived from alchemy) is the science of matter at or near the atomic scale. ... Biochemistry is the study of the chemistry of life, a bridge between biology and chemistry that studies how complex chemical reactions give rise to life. ... A complex in chemistry is a reversible association of molecules, atoms, or ions through weak non-covalent chemical bonds. ... In science, a molecule is the smallest particle of a pure chemical substance that still retains its chemical composition and properties. ... For other meanings of the word salt see table salt or salt (disambiguation). ... In chemistry, radicals (often referred to as free radicals) are atomic or molecular species with unpaired electrons on an otherwise open shell configuration. ...

Dissociation constant

For reversible dissociations in a chemical equilibrium Chemical equilibrium is the state in which a chemical reaction proceeds at the same rate as its reverse reaction; the rates of the forward and reverse reactions are equal, and the concentration of the reactants and products stop changing. ...

the dissociation constant K_d is the ratio of dissociated to undissociated compound In chemistry and biochemistry, a dissociation constant or an ionization constant is a specific type of equilibrium constant used for reversible reactions or processes. ...

Salts

The dissociation of salts by solvation in a solvent like water means the separation of the anions and cations. The salt can be recovered by evaporation of the solvent. See also: Solubility equilibrium Solvation is the attraction and association of molecules of a solvent with molecules or ions of a solute. ... A solvent is a liquid that dissolves a solid, liquid, or gaseous solute, resulting in a solution. ... Water has the chemical formula H2O, meaning that one molecule of water is composed of two hydrogen atoms and one oxygen atom. ... An anion is an ion with negative charge. ... A cation is an ion with positive charge. ... Evaporation is one of the two forms of vaporization. ... It has been suggested that this article or section be merged with chemical equilibrium. ...

Acids

The dissociation of acids in a solution means the split-off of a proton H⁺, see Acid-base reaction theories. This is an equilibrium process, meaning that dissociation and recombination takes place at the same time. The acid dissociation constant K_a is an indicator of the acid strength: stronger acids have a higher K_a value (and a lower pK_a value).gghhgh For other uses, see Acid (disambiguation). ... Dissolving table salt in water In chemistry, a solution is a homogeneous mixture composed of one or more substances, known as solutes, dissolved in another substance, known as a solvent. ... Properties In physics, the proton (Greek proton = first) is a subatomic particle with an electric charge of one positive fundamental unit (1. ... An acid-base reaction is a chemical reaction between an acid and a base. ... In chemistry and biochemistry, acid dissociation constant, the acidity constant, or the acid-ionization constant (Ka) is a specific type of equilibrium constant that indicates the extent of dissociation of hydrogen ions from an acid(I.E how well it splits H+ Ions). ...

Fragmentation

Fragmentation of a molecule can take place by a process of heterolysis or homolysis. In chemistry, heterolysis is chemical bond cleavage of a neutral molecule generating a cation and an anion. ... In chemistry, homolysis is chemical bond dissociation of a neutral molecule generating two free radicals. ...

Absorption

Receptors

Receptors are proteins that bind small ligands. The dissociation constant K_d is used as indicator of the affinity of the ligand to the receptor. The higher the affinity of the ligand for the receptor the lower the K_d value (and the higher the pK_d value). In biochemistry, a receptor is a protein on the cell membrane or within the cytoplasm or cell nucleus that binds to a specific molecule (a ligand), such as a neurotransmitter, hormone, or other substance, and initiates the cellular response to the ligand. ... A representation of the 3D structure of myoglobin, showing coloured alpha helices. ... In chemistry, a ligand is an atom, ion or functional group that is bonded to one or more central atoms or ions, usually metals generally through co-ordinate covalent bond. ... Look up affinity in Wiktionary, the free dictionary. ... Look up affinity in Wiktionary, the free dictionary. ...