Thus, these molecules can share the lone pair of electrons, giving rise to a dative bond. Decahydrate Decahydrate is a crystalline hydrate containing ten molecules of water of crystallisation per molecule of compound. Decomposition Reactions Decomposition reactions are chemical reaction in which a compound breaks down into simpler compounds or into the elements of which it is composed. Degree A degree is a division on a temperature scale. The dehydration reactions of alcohols results in their conversion into an Alkene , and involves the elimination of a molecule of water.
Dehydration requires the presence of an acid and the application of heat.
It is generally carried out in either of two ways by heating with sulphuric acid or with phosphoric acid to temperatures as high as 200 degrees, or by passing the alcohol vapour over alumina at 350-400 degrees, when the alumina serves as a lewis acid . Dehydration Reactions Dehydration reactions involve the removal of water from a substance. Examples of dehydrating agents include concentrated sulphuric acid which can remove water from a molecule, because of its high affinity for water. Deliquescence Deliquescence is the absorption of water from the atmosphere by a hygroscopic solid to such an extent that a concentrated solution of the solid eventually forms. The delocalisation of electrons in conjugated bonds results in the increased stabilisation of this type of structure.