Sulfur color, physical property

The level of technical service support provided for a given product generally tracks in large part where the suppHer considers thek product to be located within the spectmm of commodity to specialty chemicals. Technical service support levels for pure chemicals usually provided in large quantities for specific synthetic or processing needs, eg, ammonia (qv), sulfuric acid (see SuLFURic ACID AND SULFURTRIOXIDe), formaldehyde (qv), oxygen (qv), and so forth, are considerably less than for more complex materials or blends of materials provided for multistep downstream processes. Examples of the latter are many polymers, colorants, flocculants, impact modifiers, associative thickeners, etc. For the former materials, providing specifications of purity and physical properties often comprises the full extent of technical service requked or expected by customers. These materials are termed undifferentiated chemicals (9),... 

Physical Properties Sulfur mustard (mustard gas) is a colorless oil with bp of 227°C, mp of 14°C, molecular dipole moment 1.78 D (hexane), and molecular mass of 159. It normally is encountered as an impure, pale yellow-brown, odoriferous liquid. The color generally deepens with increasing amounts of impurity. HD has a vapor density of 5.4 relative to air and a vapor pressure of 0.072 mm Hg at 20°C. As a liquid, it is slightly denser than water (1.27 g/mL at 20°C). It is miscible in typical organic solvents (e.g., carbon tetrachloride, acetone or chloroform) but has a lower solubility in water (0.092 g/100 g at 22°C) (Sidell et al., 1998 Somani, 1992). 

PHYSICAL PROPERTIES oily, amber-colored liquid sulfur-like odor soluble in most organic solvents, including ethanol, propylene glycol, toluene and similar hydrocarbons practically insoluble in water sinks in water MP( <-25 C, < -13 F) BP(>140°C, >284 F at 1 atm) DN(1.1 g/mL liquid at 20°C) LSG (1.12) ST (data not available) VD (data not pertinent) VP(3x 10-" mmHgat20°C). 

In screening chemical modifiers for sulfur one looks for more than transitory improvements in the physical properties (particularly tensile and impact strength), the burning characteristics, the color, and the odor. Changes in viscosity, surface tension, and supercooling tendencies are considered secondary areas. 

Read the following description of the element zinc and indicate which are physical properties and which are chemical properties. Zinc is a silver-gray colored metal that melts at 420 °C. When zinc granules are added to dilute sulfuric acid, hydrogen is given off and the metal dissolves. Zinc has a hardness on the Mohs scale of 2.5 and a density of 7.13 g/cm at 25 °C. It reacts slowly with oxygen gas at elevated temperatures to form zinc oxide, ZnO. 

If you were asked to describe a substance, you would list its physical properties, including, perhaps, its color, feel, and smell. Charcoal is black sulfur is yellow. Glass is hard bread dough is soft. The smell of a rose is pleasant the odor of ammonia is disagreeable. 

A physical property is one that a sample of matter displays without changing its composition. Thus, we can distinguish between the radish brown solid, copper, and the yellow solid, sulfur, by the physical property of color (Fig. 1-2). 

THTOPHENE. [CAS 110-02-1]. (CH C.H)2)S, formula weight 84.H, colorless liquid resembling benzene in odor, mp —30°C, bp 84°C. sp gr 1,070. Thiophene and its derivatives closely resemble benzene and its derivatives in physical ancl chemical properties. Thiophene is present in coal tar and is recovered in the benzene distillation fraction (up to about 0.5% of the benzene present). Its removal from benzene is accomplished by mixing with concentrated sulfuric acid, soluble thiophene sulfonic acid being formed. Thiophene gives a characteristic blue coloration with isatin in concentrated sulfuric add. 

If you say that sulfur is yellow, you are stating a property of sulfur. What is meant hy property Is color a physical or chemical property ... 

Properties.—Physical.—Sulfur is usually yellow in color. At low temperatures, and in minute subdivision, as in the precipitated milk of sulfur, sulfur prsecipitatum (U. S.), it is almost or- quite colorless. Its taste and odor are faint but characteristic. At 114 (237°. 3 F.) it fuses to a thin yellow liquid, which at 150°-160 (302 -320 F.) becomes thick and brown at 330°-340° (620°— 643°.2 F.) it again becomes thin and light in color finally it boils, giving off brownish-yellow vapor at a temperature variouslv stated between 440° (824° F.) and 448 (838°.4 F.). If heated to-about 400° (753° F.) and suddenly cooled, it is converted into plastic sulfur, which may be moulded into any desired form. It is insoluble in water, sparingly soluble in anilin, phenol, benzene, benzin, and chloroform readily soluble in protochlorid of sulfur and carbon disulfid. It dissolves in hot alcohol, and crystallizes from the solution, on cooling, in white prismatic crystals. It is dimorphous. When fused sulfur crystallizes it does so in oblique rhombic prisms. Its solution in carbon disulfid deposits it on evaporation in rhombic octahedra. The prismatic ... 

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