ARTICLES AND TABLES: CHEMISTRY

Abbreviations and acronyms of chemical compounds

TABLE

Standard abbreviations and acronyms of chemical compounds used by the Journal of Organic Chemistry (JOC) require no definition.

Alphabetical list of chemical elements

TABLE

The elements of the periodic table sorted by name, symbol or atomic number. Organization of chemical elements in alphabetical order by their names (or symbols) doesn't tell us anything about their properties but it is useful when searching for an element.

Crystal systems and Bravais lattices

TABLE

Crystal system is a method of classifying crystalline substances on the basis of their unit cell. There are seven unique crystal systems: cubic, hexagonal, tetragonal, trigonal, orthorhombic, monoclinic and triclinic.

Electronic configurations of the elements

TABLE

The electron configuration describes the distribution of electrons in the shell of an atom at various energy states. This is described by the occupied sub-shells. The shell number is followed by the letter of the sub-shell, with the number of electrons in the shell indicated by a superscript number.

Fundamental physical constants

TABLE

CODATA Recommended Values of the Fundamental Physical Constants: 2014.

GHS - Hazard pictograms

TABLE

The diamond-shaped pictograms indicate the nature of the hazards associated with the use of a hazardous substance or mixture. Do you know what these pictograms mean?

History of the rare earth elements

ARTICLE: E. GENERALIC

The close chemical similarity of the rare earth elements is displayed in their occurring together in nature and further by the fact that it took nearly 150 years to isolate and identify them.

Naming of elements of atomic numbers greater than 100

ARTICLE: E. GENERALIC

In 1978 IUPAC Commission on the Nomenclature of Inorganic Chemistry decided that it is necessary to have a systematic naming for the elements with atomic number Z > 100, even for those which had not been discovered.

NFPA 704 Hazard Diamond

TABLE

NFPA 704: Standard system for the identification of the hazards of materials for emergency response.

Rare earth elements (REE)

ARTICLE: E. GENERALIC

Rare earth elements (REE) are a collection of seventeen chemical elements in the periodic table, specifically the fifteen lanthanides plus scandium and yttrium.

SI - International System of Units

TABLE

The base quantities used in the International System of Units are length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity. The corresponding base units of the SI were chosen by the CGPM to be the metre, the kilogram, the second, the ampere, the kelvin, the mole, and the candela.

Solubility product constants

TABLE

Solubility product constant (K_sp) (or the solubility product) is the product of the molar concentrations of the constituent ions, each raised to the power of its stoichiometric coefficient in the equilibrium equation.

Quantitative expression of composition of mixtures and solutions

ARTICLE: E. GENERALIC

The quantitative composition of a solution can be expressed with: concentration, fraction, ratio (molar, mass and volume), and molality.

Stoichiometric calculations - five steps to the solution

ARTICLE: E. GENERALIC

Stoichiometric calculations are based on the equalization between the ratio of the amount of substance we're interested in, and the ratio of the corresponding absolute values of the stoichiometric numbers. Almost every single stoichiometric task can be solved in five easy steps, and with only a basic knowledge of mathematics.

Chlorinity and salinity of seawater

ARTICLE: E. GENERALIC

The most characteristic feature of seawater is its salty taste. Each liter of the ocean contains approximately 34 g of dissolved salts.

History of the Periodic table of elements

ARTICLE: E. GENERALIC

Short history of how the Periodic table of chemical elements was arranged, from Lavoisier's Table of simple substances to Seaborg Actinide concept.

Divide the redox reaction into two half-reactions

ARTICLE: E. GENERALIC, N. VLADISLAVIC

A simple redox reaction in which only one species has oxidized and only one reduced can be easily separated into oxidation and reduction reactions. But how do you separate a more complex reaction into half-reactions? Here we have tried to answer that question.