antimony is a chemical element with the symbol sb from latin: stibium and atomic number 51. a lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite sb 2 s 3 .antimony compounds have been known since ancient times and were powdered for use as medicine and cosmetics, often known by the arabic name kohl. metallic antimony was also known, but it was erroneously .
oxalic acid's main applications include cleaning or bleaching, especially for the removal of rust iron complexing agent . its utility in rust removal agents is due to its forming a stable, water-soluble salt with ferric iron, ferrioxalate ion. extractive metallurgy. oxalic acid is an important reagent in lanthanide chemistry.
the plastic material was patented by alexander parkes, in birmingham, england in 1856. it was unveiled at the 1862 great international exhibition in london. parkesine won a bronze medal at the 1862 world's fair in london. parkesine was made from cellulose the major component of plant cell walls treated with nitric acid as a solvent.
deet is an effective solvent, and may dissolve some watch crystals, plastics, rayon, spandex, other synthetic fabrics, and painted or varnished surfaces including nail polish. it also may act as a plasticizer by remaining inside some formerly hard plastics, leaving them softened and more flexible. .
a substantial proportion of the gold is 'invisible gold' incorporated into the pyrite see carlin-type gold deposit . it has been suggested that the presence of both gold and arsenic is a case of coupled substitution but as of 1997 the chemical state of the gold remained controversial.
nitric acid h no 3 , also known as aqua fortis latin for 'strong water' and spirit of niter, is a highly corrosive mineral acid.. the pure compound is colorless, but older samples tend to acquire a yellow cast due to decomposition into oxides of nitrogen and water. most commercially available nitric acid has a concentration of 68% in water.
surface plasmon resonance spr is the resonant oscillation of conduction electrons at the interface between negative and positive permittivity material stimulated by incident light. spr is the basis of many standard tools for measuring adsorption of material onto planar metal typically gold or silver surfaces or onto the surface of metal nanoparticles.
although it is a closed-cell foam, both expanded and extruded polystyrene are not entirely waterproof or vaporproof. in expanded polystyrene there are interstitial gaps between the expanded closed-cell pellets that form an open network of channels between the bonded pellets, and this network of gaps can become filled with liquid water. if the .
solid foams can be closed-cell or open-cell. in closed-cell foam, the gas forms discrete pockets, each completely surrounded by the solid material. in open-cell foam, gas pockets connect to each other. a bath sponge is an example of an open-cell foam: water easily flows through the entire structure, displacing the air.