Soluble carbon rods

Scheme 13-14 Preparation of the soluble carbon rods 58a-e which have a polytriacetylene backbone. The length shown is the distance between the two extreme tips of the end-capping phenyl rings.

Tetrachromium Dicarbide, Cr C -— By melting chromium at temperatures above 1840° C. for fifteen minutes in a crucible of pure carbon, frequently stirring vith a carbon rod, alloys saturated with carbon are obtained. These contain no free chromium, but only carbide and graphite. On washing with hot 24 per cent, hydrochloric acid part of the alloy dissolves, and the ratio of chromium to carbon dissohing indicates that the soluble carbide has the composition Cr Cg, but the existence of this has not been confirmed by isolation. 

However, sulfur is poorly soluble in common solvents at room temperature. Consequently, Berge [282] introduced sulfur in an electrode together with powdered graphite to assure sufficient electric conductivity (1 part carbon for 4 parts sulfur). Later on [283], improvement of the building of such a sacrificial electrode was proposed A mixture of carbon - - sulfur (1/2, w/w) was introduced in a test tube and heated at 130 C in an oven. After melting, a carbon rod or stainless-steel bar is introduced in the melt to assure electric contact. After return to room temperature, the test tube is broken to release the compact electrode. Similarly, by using this procedure, small-area electrodes could be built up by using Pasteur pipette for voltammetric analysis. 

EINECS 215-234-0 Ytterbium (III) oxide Ytterbium oxide Ytterbium oxide (Yb203). Used in special alloys, dielectric ceramics, carbon rods for industrial lighting, catalyst, and special glasses. Solid soluble in dilute xids. Atomergic Chemetals Noah Chem. Rhone-Poulenc. 

J.2 Stable Soluble Conjugated Carbon Rods with a Polytriacetylene Backbone... 

Anthony, J.A., Boudon, C., Diederich, E, Gisselbrecht, J.R, GramHch, V, Gross, M., Hobi, M., and Seiler, R, Stable, soluble, conjugated carbon rods with a persilylethynylated polytriacetylene backbone, Angew. Chem. Int. Ed. Engl, 33, 763,1994. 

The calcium salt is thereby converted into the soluble potassium salt and calcium carbonate is precipitated. The latter is removed by filtration, as before, and the filtrate concentrated on the water-bath to a small volume until a drop of the liquid, removed on the end of a glass rod, crystallises at once on cooling. 

Linseed oil turpentine beeswax 3.0 g (NH4) 2CO3 (ammonium carbonate) egg yolk soluble starch distilled water 10 ml graduated cylinder four 250 ml beakers small test tube Bunsen burner stirring rod four watch glasses paintbrush centigram balance. 

Sodium hydroxide forms fused solid pieces, granules, rods, or powder. It rapidly absorbs moisture and carbon dioxide from the air. Solutions of sodium hydroxide are very corrosive to animal tissue, and aluminum. It has a melting point of 318 Celsius. Sodium hydroxide is very soluble in water and alcohol. It generates large amounts of heat when dissolving in water, or when mixed with acid. Sodium hydroxide is toxic. Handle sodium hydroxide with care. Sodium hydroxide is a widely available commercial chemical, which is sold under a variety of names such as Lye . Sodium hydroxide is prepared on an industrial scale in a procedure called the chloro-alkali process. In the chloro-alkali process, a sodium chloride solution is electrolysized in a special cell composed of two compartments separated by a porous membrane. Chlorine gas is produced at the positive anode, and sodium hydroxide forms at cathode. 

Potassium compounds impart a violet color to a nonluminous flame if not masked by the presence of small quantities of sodium. In neutral, concentrated or moderately concentrated solutions of potassium salts, sodium bitartrate TS (10%) slowly produces a white, crystalline precipitate that is soluble in 6 N ammonium hydroxide and in solutions of alkali hydroxides or carbonates. The precipitation may be accelerated by stirring or mbbing the inside of the test tube with a glass rod or by the addition of a small amount of glacial acetic acid or alcohol. 

Silk fibers are smooth, translucent, rod-like filaments with occasional swellings along their length. The raw silk fiber actually consists of two filaments called fibroin bound by a soluble silk gum called sericin. Fibroin and sericin are made up of carbon, hydrogen, nitrogen, and oxygen. 

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