Solids ciystalline

Why is filter paper a poor choice of sirrface on which to powder or crush a solid ciystalline sample before placing it in a capillary melting-point tube ... 

It is evident that this modified method is not absolutely accurate since other constituents, besides cineol, are undoubtedly included in the portion boiling between 170 and 190 0. A further objection is the separation of the solid ciystalline double compound with oils rich in cineol. 

Cyanuiic acid is an ododess, white, ciystalline solid that does not melt up to 330°C at higher temperatures it sublimes and dissociates to isocyanic acid (HNCO) [75-13-8],... 

Chloral hydrate is obtained by the action of chlorine upon ethyl alcohol. The solid chloral alcoholate is foimed, CClj.CHOH.OCjHj, which, when decomposed with sulphuiic acid, yields chloral, CCI3.COH, a licpiid which combines with water to form the ciystalline hydrate. 

During the conversion process, the object is to create uranium hexafluoride (UF ), a highly corro-sh e substance that is gaseous at high temperatures, but is a white crystalline solid at lower temperatures. Uranium hexafluoride is easily transported in its ciystalline form to an enrichment facility (the step taken after conversion), but the gaseous form is well suited for the enrichment process, itself. First, the... 

Sulfamic acid (HOS02NH2). Clean at only 120 °F (49 °C) for cast iron and up to 140 °F for marstenitic SS (60 °C). It is not suitable for galvanizing or aluminum over 150 °F, but it is suitable for copper, brass, and SS. Sulfamic acid tends to be used only in small systems because of its relatively high cost. It is a ciystalline solid and so is easily transported. Additionally, in the diy form it is relatively safe and has a negligible effect on skin. Typically, it is used at 10% strength, and when 5% sodium chloride is added, it is reasonably successful at dissolving ferric oxide. 

Duiser,J.A., Staverman,AJ. On the theory of rubber elasticity. In Prins,J. A (Ed.) Physics of non-ciystalline solids, pp. 376-387. Amsterdam North Holland Publ. 1965. 

THIOUREA. [CAS 62-56-6] (NH2)2CS, formula weight 76.12, white ciystalline solid, mp 180-182cC, decomposes before boiling at atmospheric pressure, sp gr 1,405. Thiourea is moderately soluble in H20, soluble in alcohol, and slightly soluble in ether. Sometimes referred to as... 

Properties. The DPXs are all ciystalline solids melting points and densities arc given in Tabic I. Their solubility in aromatic hydrocarbons is limited. 

Topic Ciystalline Solids Sci Links code HW4037... 

Composite materials are mechanical dispersions of radioactive solids, for instance ciystalline or vitreous radioactive phases in metal matrix [24], glass-encapsulated Ca-phosphate based ceramics [30] glass-bonded sodalite [31,32] glass-ceramics for plutonium waste immobilization [33] and so on. 

Polymer, as solid, has imperfect supermolecular structure it has amorphous regions, regions without structures and ciystalline regions with well packed maeromolecules. Lamellar monociystals (lamellae) in which maeromolecules are placed perpendicular to wide surface of a plate are the main structure of polymer crystalline part. Usually length of macromolecule being crystallized greatly exceeds thickness of lamella and, to be placed into the crystal, macromolecule must repeatedly fold. 

It is a fuming, colorless liquid, which solidifies at —20 (—4 F.), the solid fusing at —6 (21 . 2 F.). It absorbs moisture from air. With a small miantity of H,0, and by evaporation over H,SO it forms a hydrate, SbCl,4H, which appears in transparent, deliquescent ciystals. With more H,0 a ciystalline oxychloride, SbOCl, is formed and with a still greater quantity, a white precipitate of orthoantimonic acid, H,SbO,. 

MifrisHc octt/—C H CO,OH—228 —A ciystalline solid, fusible at 54° (129°.3 F.) existing in many vegetable oils, cow s butter, and spermaceti. 

Pure oleic acid is a white, pearly, ciystalline solid, which fuses to a colorless liquid at 14 (57 .2 F.) it is cdorless and tasteless soluble in alcohol, ether, and cold H,SO insoluble in H,0 sp, gr. 0.808 at 19 (66 .2 F.). Neutral in reaction. It con be distilled in vacuo vrithout decom-poaitioD, but when heated in contact with air, it is decomposed with formation of bydrocarbons, volatile fatty acids, and sebacic acid. It dissolves the fatty acids readily, forming mixtures whose consistency varies with the proportions of liquid and solid acid which they contain. The solid acid is but little alter by exposure to air, but when liquid it absorbs O rapidly, becomes yellow, rancid, acid in reaction, and incapable of soUdi ng when cooM these changes take place the more rapidly the higher the temperature. 

Castor-oil Oleum ncini (6 6., Br.)—is usually obtained by expression of the seeds, although in some countries it is prepared by decoction or by extraction with alcohol. It is a thick, viscid, yellowish oil, has a faint odor and a nauseous taste. It is more soluble in alcohol than any other fixed vegetable oU, and ia also very soluble in ether. It saponifies very readily. Ammonia separates from it a ciystalline solid, fusible at 6fl (158 8 F.) rictso/aim de. Hot HNO, attacks it energetic y, and finally converts it into suberic ctcid. 

IL—Vltelin exists in the yolk of egg and in the ciystalline lena It is soluble in dilute solution of sodium cmLoride, from which it is precipip tated by excess of H,0 by heatiiig to 75 -80 (167°-176 F.) and by aloohoL It is not precipitated by solid sodium chloride. It dissolves in weak alkaline solutions without alteration and in very dilute HQ (1-1000), by which it is quickly converted into syntonin. 

The traditional definition of a zeolite refers to microporous, crystalline, hydrated aluminosilicates with a three-dimensional framework consisting of comer-linked SiO or AlO tetrahedra, although today the definition is used in a much broader sense, comprising microporous ciystalline solids containing a variety of elements as tetrahedral building units. The aluminosilicate-based zeolites are represented by the empirical formula... 

PHYSICAL PROPERTIES White to light yellow to reddish ciystalline solid or liquid sweet odor insoluble in water miscible with organic liquids MP (112-114°C, 234-237°F) BP (340°C, 644°F) DN (1.203 g/mL at 20°C). 

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