Rubber - Chemistry Encyclopedia
Rubber is an elastomer—that is, a polymer that has the ability to regain its original shape after being deformed. Rubber is also tough and resistant to weathering and chemical attack.
Rubidium - Chemistry Encyclopedia
Ruthenium - Chemistry Encyclopedia
Rutherfordium - Chemistry Encyclopedia
Salt - Chemistry Encyclopedia
The word "salt" is a general chemical term that refers to ionic compounds formed when an acid reacts with a base.
Samarium - Chemistry Encyclopedia
Scandium - Chemistry Encyclopedia
Secondary Structure - Chemistry Encyclopedia
The secondary structure refers to the conformation present at a local region of a polypeptide. A few types of secondary structure are particularly stable and occur widely in proteins.
Selenium - Chemistry Encyclopedia
Semiconductors - Chemistry Encyclopedia
The development of semiconductors is clearly among the most significant technological achievements to evolve from the study of solid-state chemistry and physics. Aside from their well-known applications in computers and electronics, semiconductors are also used in a wide variety of optical devices such as lasers, light-emitting diodes, and solar panels.
Silicon - Chemistry Encyclopedia
Silicone - Chemistry Encyclopedia
The term "silica" denotes the compound silicon dioxide, SiO2. It is a ubiquitous chemical substance with rich chemical, geological, and commercial importance.
Silver - Chemistry Encyclopedia
Soap - Chemistry Encyclopedia
Soaps are cleaning agents that are usually made by reacting alkali (e.g., sodium hydroxide) with naturally occurring fat or fatty acids. The reaction produces sodium salts of these fatty acids, which improve the cleaning process by making water better able to lift away greasy stains from skin, hair, clothes, and just about anything else.
Sodium - Chemistry Encyclopedia
Solar Cells - Chemistry Encyclopedia
A solar cell is, in principle, a simple semiconductor✶ device that converts light into electric energy. The conversion is accomplished by absorbing light and ionizing crystal atoms, thereby creating free, negatively charged electrons and positively charged ions.
Solid State - Chemistry Encyclopedia
Matter is commonly encountered in one of three states—solid, liquid, or gas. Air is an example of a gas and water an example of a liquid.
Solid-State Devices - Chemistry Encyclopedia
Solid-state devices are the controlling components of both high-tech and very ordinary devices. Their widespread usage is related to the fact that they can be utilized to interface with all human senses.
Solution Chemistry - Chemistry Encyclopedia
The majority of chemical processes are reactions that occur in solution. Important industrial processes often utilize solution chemistry.
Spectroscopy - Chemistry Encyclopedia
Spectroscopy is the measurement of interactions between electromagnetic radiation and matter. Electromagnetic radiation, which includes light, has characteristics of waves and particles.
Rutherford, Ernest - Chemistry Encyclopedia
Ernest Rutherford was born on August 30, 1871, near Nelson, New Zealand. He was a very good student, excelling at science and mathematics.
Rydberg, Johannes - Chemistry Encyclopedia
Johannes Robert Rydberg was born in Halmstad, Sweden, on November 8, 1854. His father, Sven, was a local merchant and minor shipowner who died when Rydberg was young.
Sanger, Frederick - Chemistry Encyclopedia
Frederick Sanger is surely one of the most outstanding biochemists of modern times. His methods for determining the exact sequence of amino acids in proteins and of nucleotides in deoxyribonucleic acid (DNA) have won him numerous awards, including two Nobel Prizes in chemistry.
Scheele, Carl - Chemistry Encyclopedia
Swedish chemist Carl Wilhelm Scheele, who discovered oxygen with Joseph Priestley and Antoine-Laurent Lavoisier.
Schrödinger, Erwin - Chemistry Encyclopedia
Erwin Schrödinger was born in Vienna, Austria, in 1887. In 1906 he entered the University of Vienna with the intention of studying statistical thermodynamics with the mathematician and physicist Ludwig Boltzmann.
Seaborg, Glenn Theodore - Chemistry Encyclopedia
Seibert, Florence - Chemistry Encyclopedia
Florence Seibert made several important contributions to medicine during her long career. Most notably, she purified a protein from tuberculosis bacteria that became the international standard for tuberculosis testing.
Soddy, Frederick - Chemistry Encyclopedia
Frederick Soddy, the youngest of seven sons of a London corn merchant, was born on September 2, 1877, in Eastbourne, England. Raised by his half-sister, this precocious scientist attended Eastbourne College (1892–1894) and the University College of Wales, Aberystwyth (1895).