Moth balls

Naphthalene, Ci0Hs, is the compound present in moth balls. When one mole of naphthalene is burned, 5.15 X 103 kj ofheat is evolved. A sample of naphthalene burned in a bomb calorimeter (heat capacity = 9832 J/°C) increases the temperature in die calorimeter from 25.1°C to 28.4°C. How many milligrams of naphthalene were burned ... 

Naphthalene, Ci0H8, is the substance present in some moth balls. Its vapor pressure at 25°C is 0.300 mm Hg. 

Possible danger to respiratory tract from fumes ammonia, acetone, nail polish remover, heated sulfur, moth balls Make sure there is good ventilation. Never smell fumes directly. Wear a mask. Leave foul area and notify your teacher immediately. 

Substances that can irritate the skin or mucus membranes of the respiratory tract pollen, moth balls, steel wool, fiber glass, potassium permanganate Wear dust mask and gloves. Practice extra care when handling these materials. Go to your teacher for first aid. 

Let s say that there are two unknowns, A and B. Say one of them can be biphenyl (a colorless compound that smells like moth balls). You spot two plates. One with A and biphenyl, side by side. The other, B and biphenyl, side by side. After you develop both plates, you have the results shown in Fig. 97. 

Dlchlorobenzene Deodorant, mold and mildew control. Air fresheners/deodorizeis, toilet bowl and waste can deodorizers, moth balls and mothflakes. 018 Inadequate data... 

Synonyms AI3-00278 Albocarbon BRN 1421310 Camphor tar Caswell No. 587 CCRIS 1838 EINECS 202-049-5 EPA pesticide chemical code 055801 Mighty 150 Mighty RDl Moth balls Moth flakes Naphthalin Naphthaline Naphthene NCI-C52904 NSC 37565 RCRA waste number U165 Tar camphor UN 1334 White tar. 

White, crystalline flakes, or powder with a strong aromatic odor resembling coal-tar or moth balls. At 40 °C, the average odor threhold concentration and the lowest concentration at which an odor was detected were 6 and 2.5 pg/L, respectively. Similarly, at 25 °C, the average taste threshold concentration and the lowest concentration at which a taste was detected were 50 and 25 pg/L, respectively (Young et ah, 1996). A detection odor threshold concentration of 200 pg/m (38 ppbv) was experimentally determined by Punter (1983). 

Children may be accidentally exposed to the chemical if they eat moth balls or toilet deodorizers. Occupational exposure is primarily associated with inhalation exposure or dermal contact with... 

Children are exposed to 1,4-diehlorobenzene primarily by inhalation of vapors from toilet deodorants, moth proofing crystals and moth balls used in the home or by consumption of moth balls. Consumption of 1,4-dichlorobenzene in foods (See Section 5.4.4) and drinking water (See Section 5.4.2) contaminated with 1,4-dichlorobenzene is thought to be a minor exposure pathway. There have been no body burden measurements made on children. 

In addition, individuals using space deodorants (air fresheners), toilet block deodorants, or moth repellents (moth balls or crystal) containing 1,4-dichlorobenzene in their homes have the potential for high exposure to this compound (Scuderi 1986). Indoor air concentrations resulting from the use of these products in bathrooms and closets have been measured at levels up to 1.3 mg/m (0.22 ppm) (Scuderi 1986). 

A 0.9222-g sample of naphthalene, C10Hg(s), a major component of moth balls, is burned in a calorimeter that has a heat capacity of 9.44 kJ-(°C) 1. The temperature of the calorimeter rose from 15.73°C to 19.66°C. Calculate the standard enthalpy of formation of naphthalene. 

As an example of how combustion analysis works, imagine that we have a sample of a pure substance—say, naphthalene (often used for household moth balls). We weigh a known amount of the sample, burn it in pure oxygen, and then analyze the products. Let s say that 0.330 g of naphthalene reacts with 02 and that 1.133 g of C02 and 0.185 g of H20 are formed. The first thing to find out is the number of moles of carbon and hydrogen in the C02 and H20 products so that we can calculate the number of moles of each element originally present in the naphthalene sample. 

Consider the sublimation of moth balls at 27°C in a room having dimensions 8.0 ft X 10.0 ft X 8.0 ft. Assume that the moth balls are pure solid naphthalene (density 1.16 g/cm3) and that they are spheres with a diameter of 12.0 mm. The equilibrium constant Kc for sublimation of naphthalene is 5.40 X 10-6 at 27°C. 

To make, place a 1-pound chunk of commercial pressed-wood fixe log in a microwave and heat for about 3 1/2 minutes (at defrost). Remove and break the chunk apart with a fork. Pour the resulting loose mixture into a 3-pound coffee can and add a 1-pound box of napthalene moth crystals. (If for some reason moth balls must be used, they should be soaked in a little diesel for a week or so, which will dissolve them.) Put the Lid on the can and shake to mix. Pour in diesel fuel until the mixture is well soaked. Do not use too much diesel—about a quart is usually fine, but this may vary. Stir until evenly mixed. Let it sit for a couple of days and stir again. The napthalene should be dissolved. It is now ready to use. 

Uranium recovery was briefly described in the ninth edition. Since 1990, all uranium recovery contracts have expired in the United States and the recovery facilities moth-balled or scrapped. There is no indication the situation will change in the near future, because the reduced price of uranium no longer makes its recovery from phosphoric acid economical. 

The largest variability is found for the substance p-dichlorobenzene, which is used in for instance moth balls and space deodorants. Details collected from the documentations of the different OELs for p-dichlorobenzene are presented in Tables 9.6 and 9.7. The ACGIH is included due to its influence, and also the UK health and safety executive refers to the ACGIH documentation for the UK OEL. 

Mononitronapthalene is the product of the nitration of napthalene with a mixed acid mixture of nitric and sulfuric acids at 50 degrees centigrade. Napthalene is a common coal tar chemical. It should be available in the form of moth balls. Check the ingredient lable of moth balls to find the active ingredient. 

Napthalene CioHg moth balls hardware store... 

Uses used as moth balls and in dye, resin, and plastic industries... 

SYNS CAMPHOR TAR MIGHTY 150 MOTH BALLS (DOT) MOTH FLAKES NAFTALEN (POLISH) O NAPHTHALENE, crude or refined (DOT) NAPHTHALENE, molten pOT) NAPHTHALIN pOT) NAPHTHALINE NAPHTHENE NCI-C52904 RCRA WASTE NUMBER UT65 TAR CAMPHOR W HITE TAR... 

Unless stored in perfect conditions, an object made of celluloid can degrade, giving off a smell of camphor (which smells like moth balls), and turning sticky or powdery (Fig. 13.3). 

If the analyst had smelled the substance, and noticed an odor resembling moth balls, he would have identified the substance as naphthalene, CjoHg, and on the basis of this analysis he would have been justified in saying that the naphthalene was pure.)... 

In addition to benzene and its derivatives, there exist other aromatic hydrocarbons, containing two or more rings of carbon atoms. Naphthalene, CioHg, is a solid substance with a characteristic odor it is used as a constituent of moth balls, and in the manufacture of dyes and otlier organic compounds. Anthracene, and phenanthrene,... 

The compound of which common moth balls are made is paradichlorbenzene. Certain substituted benzene compounds retain their common names. Some of these are shown in Figure 1.23. 

Naphthalene as such has several important uses. Its most common use is as a germicide or insecticide against the attacks of the moth miller larvae in the form of what is known as moth-balls. A more important use is as an enricher or carburetter of water gas for illuminating purposes. As it contains a large amount of carbon it burns with a very luminous flame and thus makes more luminous a weakly illuminating gas. The most important uses of all, however, are as a source of ortho-phthalic acid and in yielding derivatives which are used as dyes. 

The world s consumption of camphor is about 5000-6000 tons. Camphor is also produced somewhat in Italy and in Florida and Texas. Most of the camphor is utilized in the manufacture of celluloid (p. 376), about 70 per cent of the product being thus used under normal conditions. About 2 per cent is used in the manufacture of explosives, to make them insensitive to shock 13 per cent for pharmaceutical preparations and 15 per cent for miscellaneous purposes. Its most common use is as an insecticide for the moth larvae in which use it is largely replaced by naphthalene in the form of moth balls. 

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