Molecular Orbital Theory
The Lewis structures, the VSEPR theory and the valence binding method form a powerful combination to describe covalent bonding and molecular structures. The results are satisfactory for most of our purposes. However, sometimes, chemists need […]
Changes of states of matter
Matter is everything that surrounds us that has mass and weight, that occupies a place in the space, that is perceptible by one of our senses and that is opposed to changing position, which is, […]
Empirical and molecular formula
The empirical formula is the simplest expression to represent a chemical compound. It tells us the elements that are present and the minimum proportion in whole numbers between their atoms. This formula is also known […]
Chemical Kinetics theory
Chemical Kinetics Chemical Kinetics studies the speed of chemical processes and determines the factors which influence on it. It aims is to find mathematical expression that relates the speed of a chemical reaction with […]
Van der Waals Forces
Van der Waals Forces theory Van der Waals forces, although they don’t form a chemical bond theirselves, they are responsible for the attraction between neutral and saturated molecules, which result in the condensed states […]
Periodic System Theory
Periodic System The current Periodic System is based on the one which was proposed by Mendeleiev with the inherent corrections to Moseley’s law, as it is said, used as sort order atomic number. It […]
Hydrogen Bond Theory
Hydrogen Bond Many hydrogenated compounds have properties some abnormal that can be interpreted by assuming that amongst its molecules is formed a special type of link, characteristic of hydrogen atoms, called as Hydrogen Bond, […]
Covalent Bond theory
Covalent Bond Covalent Bond (nonmetal-nonmetal): There are many molecules whose formation can not be explained by the ionic bond, the simplest cases are molecules which are composed of identical atoms, such as H2, […]
Stoichiometry theory
Stoichiometry Stoichiometry theory Lavoisier’s law of mass conservation: The total mass of the substances involved in chemical transformation remains constant and therefore the sum of the masses of the reactants must be equal to […]
Chemical calculations theory. Dissolutions
Dissolutions Dissolutions are homogeneous mixtures resulting from the interposition of atoms, molecules or ions from two or more substances, called components, which are involved in varying proportions. WAYS TO EXPRESS THE CONCENTRATION OF […]
