Physical properties bleach

The knowledge that allows chemists to describe, interpret, and predict the behavior of chemical substances is gained by making careful experimental measurements. The properties of a sample can be divided into physical properties, which can be measured without observing a chemical reaction, and chemical properties, which are displayed only during a chemical transformation. Physical properties include familiar attributes such as size, color, and mass. Some chemical properties also are familiar to us. As examples, bleach reacts chemically with many colored substances to destroy their colors, and molecular oxygen reacts chemically with many fuels to generate heat. 

Hydrosilation inhibitors, in paper release coating fabrication, 22 591-592 Hydrosilation silicone, heat-curable, 10 5 Hydrosilylation. See also Silylation monoallyl derivatives, 2 242 products of, 22 552-554 Hydrosorbic acid, physical properties, 5 31t Hydrostatic cooker, 12 81 Hydrostatic lubrication, 15 212 Hydrosulfide salts, oxidation of, 23 633 Hydrosulfite bleaching, 21 50, 52 of recycled pulps, 21 52 Hydrosulfite-induced reductive-cleavage, 9 439-140... 

Descriptions of the chemical and physical properties of rayon can be found (3, 43). Rayons have good resistance to dry-cleaning solvents, and both oxidizing and reducing bleaches may be used with suitable precaution (31). Perspiration can degrade the fibers on prolonged exposure. 

Typical chemical and physical properties of these fibers have been discussed (68). In slightly acidic or basic conditions at room temperature, acetate and triacetate fibers are very resistant to chlorine bleach at the concentrations normally encountered in laundering (68). Acetate and triacetate fibers are not affected by the dry-cleaning solutions normally used in the United States and Canada, but triacetate is softened by trichloroethylene (68). Delustering can be accomplished by hot soap solutions (72) so caution needs to be applied during cleaning of acetate fabrics. The immediate cause of delustering by hot soap solutions is the... 

The chemical and physical properties of nylons have been extensively described (76). Nylon will not support mildew or bacteria. Moth larvae may bite their way through nylon if imprisoned. In soil burial tests, it was found that nylon 6 retained more than 95% of its strength after six months. By contrast, wool and cotton were rotten after one month (3). Nylon may be affected by chlorine bleach, and strong oxidizing bleaches can damage it (31). 

Summaries of chemical and physical properties of different polyester fibers are available (107). Polyesters display excellent resistance to conventional textile bleaching agents and are most resistant to cleaning solvents (107). Mold, mildew, and fungi may grow on finishes applied to polyester fabrics but do not attack the fiber itself (3). Again, insects that devour natural fibers normally do not affect polyester fibers although they may cut their way out of the fabric if trapped. 

Timms (21) has heat of fusion to 17.7-22.3 kcal/kg for milkfat, 24-31 kcal/kg for fully hardened milkfat, 26-29 kcal/kg for cocoa butter in the p polymorph, 22.6 kcal/kg for refined, bleached, and deodorized (RBD) palm oil, 29.7 kcal/kg for RBD palm kernel oil, 26.0 kcal/kg for RBD coconut oil, 31.6 kcal/kg for fully hardened palm kernel oil, and 31.2 kcal/kg for fully hardened coconut oil. The heat of fusion is an empirical physical property dependent on the thermal history or tempering of the oil. 

Which of the following are chemical properties, and which are physical properties (a) Metallic sodium is soft enough to be cut with a knife, (b) When sodium metal is cut, the surface is at first shiny after a few seconds of exposure to air, it turns a dull gray, (c) The density of sodium is 0.97 g/mL. (d) Cork floats on water, (e) When sodium comes in contact with water, it melts, evolves a flammable gas, and eventually disappears altogether, (f) Household bleach changes the color of your favorite T-shirt from purple to pink. 

PHYSICAL PROPERTIES dark, reddish-brown, fuming liquid reddish-brown vapor rhombic crystals diatomic liquid heavier than water suffocating, bleach odor freely... 

Appliance manufacturers, especially washer manufacturers, have also foimd wide use for EPDM. Its heat and chemical resistance combined with its physical properties make it ideal for such appliances as door seals and cushions, drain and water-circulating hoses, bleach tubing, inlet nozzles, boots, seals, gaskets, diaphragms, vibration isolators, and a variety of grommets. This elastomer is also used in dishwashers, refrigerators, ovens, and a variety of small appliances. 

A simpler and more rapid but less accurate assay can be made ftrom the specific gravity of the bleach solution. For best results, this requires knowledge of the excess caustic concentration. The presence of excess caustic soda increases the specific gravity by a small but significant amount. Chlorine Institute Pamphlet 96 [80] gives some physical properties. It indicates that, at 20°C, the specific gravity of NaOCl solutions derived... 

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