Naphthalene Essays

However, it dissolved in non-polar solvent toluene and slightly in ethanol, which means naphthalene is non-polar. It has high resistivity in aqueous solution and solid form, and respective melting point. The sample was given as solid with large shiny white crystals. Silicon carbide was classified in this experiment as macromolecular structure

To study the thermodynamics of solubility of naphthalene in diphenylamine Introduction: Phase equilibrium is a state of balance which rate of transfer of matter or heat from one phase to the other is equal to the rate of transfer in the reverse direction at equilibrium. The driving force for a phase change is the minimization of free energy and causing material or heat transfer are balanced at equilibrium. The equilibrium phase is always

Arsenic: The primary routes of arsenic exposure are ingestion (about 80%) (Vahter, 2002) and inhalation. Ingestion most commonly occurs through consumption of food and water containing arsenic. Inhalation commonly occurs from the following sources: naphthalene containing moth repellents and tobacco smoke. The less common route of exposure is the dermal route, e.g. dermal contact when handling preserved wood products containing arsenic (Agency for Toxic Substances & Disease Registry, 2010). 2. Distribution

calorimeter was used in the experiment to determine the standard heat of combustion and formation of naphthalene. The heat capacity, C(s), of the bomb calorimeter obtained from a standard benzoic acid combustion was 10792.3±184.651 J/℃. Using this C(s), the enthalpy of combustion (∆Hcombust) of naphthalene was determined to be -5134.96±33.3433 kJ/mol. The final standard formation ((∆Hf, C10H8。) of naphthalene was 56.438±33.3433 kJ/mol, which was not very close to the theoretical value. Since only two runs

temperatures), dimethyl naphthalene (C12H12) which comes in 10 forms aka isomers, and carbon dioxide (CO2). “Decane can be extracted from various petroleum solvents, such as Stoddard solvent, via fractional distillation” (Sciencemaddness Discussion Board, 2016), (fractional distillation - separation of a liquid mixture into fractions differing in boiling point), which is also very toxic if consumed and should always be stored in tightly-closed bottles away from heat. Dimethyl naphthalene, not only is it

Heating and Cooling Curves Introduction: Experiments 6 and 7 were concerned with the exchange of heat between a substance and its surroundings when the substance undergoes a change in phase. This transfer of heat was indicated by measuring its effect on the temperature of the surroundings (the water in a calorimeter). No direct measurements of the substance undergoing change were made. In this experiment you will observe, by direct measurement, the effects of cooling and heating a pure substance

smoking is bad, it's just a fad 2.Nicotine, tar, ammonia, formaldehyde, carbon monoxide, Polonium, Methyl isocyanate, Naphthalene, Maltitol, and Megastigmatrienone 3. long term: many types of cancer, Chronic Obstructive Pulmonary Disease, Heart disease, heart attack ,and stroke. Short term: bad breath, increase in blood pressure, heart rate, the flow of blood from the heart, and the arteries to narrow 4.1. Each day more than 3,200 people under 18 smoke their first cigarette, 2. around 2,100 youth

accessories, and diesel engines can reach on-board efficiencies of 20%. The safety data sheet for unleaded gasoline shows at least 15 hazardous chemicals occurring in various amounts, including benzene (up to 5% by volume), toluene (up to 35% by volume), naphthalene (up to 1% by volume), trimethylbenzene (up to 7% by volume). People can be exposed to gasoline in the workplace by swallowing it, breathing in vapors, skin contact, and eye contact. The National Institute for Occupational Safety and Health (NIOSH)

physical and chemical peroperties of the oil, rate of hydrocarbon metabolism by microorganism and composition of the microbial community (10). Aghamiri (10) and Lin (25) have been reported optimum temperature for biodegradation of crude oil and naphthalene as 30ºC. Das & Chandran (26) reported that highest degradation rates of petroleum that generally occure in the range 30-40ºC in soil environment, 20-30ºC in some freshwater environments and 15-20ºC in marine environments. Although biodegradation

Gasoline is a petroleum-derived liquid that is used primarily as a fuel in internal combustion engines. It consists mostly of organic compounds refined from petroleum, and is then enhanced with additives. When under enough pressure (such as in internal combustion engines) gasoline tends to auto-ignite causing damage to the components, this phenomena is called "engine knocking.” To prevent this from occurring, refineries add chemical compounds to increase the fuel’s resistance, or octane rating, to

Purpose/Introduction The process of recrystallization is an important method of purifying a solid organic substance using a hot solution as a solvent. This method will allow the separation of impurities. We will analyze Benzoic Acid as it is dissolved and recrystallized in water and in a solvent of Methanol and water. Reaction/Summary In Experiment One we will be recrystallizing Benzoic Acid from water. In Experiment Two we will be recrystallizing Benzoic Acid using a solvent pair made up of Methanol

0.005 ppm, this shows that flowback waste was over 300 times the safe levels for ethylene dichloride (EPA Ethylene Dichloride, January, 2000). Another dangerous fluid in the fracking fluid is naphthalene, an aromatic hydrocarbon, which is toxic in a high levels as well as a mild carcinogen (EPA Naphthalene, January, 2000). Other toxins or dangerous chemicals are in fracking fluid are: 1,2,4-Trimethylbenzene (an aromatic hydrocarbon), aldehyde, heavy aromatic petroleum naphtha (a hydrocarbon-petroleum

lookout for them when you’re on walks or at the dog park, too. Get Rid Of Mothballs: Mothballs often make their way into the corners and closets of homes in the fall, and they pose a serious health risk to dogs because of the harmful chemicals, like naphthalene, they put off. If eaten, your dog may experience abdominal pain, vomiting, excessive drooling, and can even organ failure. Keep Them Warm: In some parts of the country, fall can bring on dangerously cold temperatures. Just as you shouldn’t leave

binding site, an aromatic CH probe was used to locate hydrophobic regions (Patrick, 2013, p. 407). It was found that the pteridine ring of CB 3717 formed its hydrogen bond within a hydrophobic region. Based on this, the researchers determined that a naphthalene ring could be a reasonable replacement for the pteridine group, with ample room to include a substituent that could recreate the hydrogen bonding

I. INTRODUCTION This report discusses an experiment, the objective of which was to determine the classification of six known chemicals: sodium nitrate, barium chloride, silicon carbide, naphthalene, urea, and antimony and two unknown chemicals XIa and XIb. Since each type of chemical (ionic, molecular, macromolecular and metallic) has its own set of properties, by testing these properties and finding them out for each chemical, it was possible to classify them. The properties tested during this

There are some reports that they may be repelled by the scent of wood from juniper and cedar, by lavender, or by other natural oils; however, many consider this unlikely to prevent infestation. Naphthalene (the chemical used in mothballs) is considered more effective, but there are concerns over its effects on human health. Moth larvae may be killed by freezing the items which they infest for several days at a temperature below −8 °C (18 °F).[7]

paradox in the poem in which a person must die in order to conquer the fever; "horrible throbbing" symbolizes as the narrators heartbeat and the explaining of the speaker not wanting to be alive. Due to them not wanting to live their life, the naphthalene could have symbolized them killing themselves. Today, death is looked upon as a horrible thing, in For Annie death is portrayed as a relief. The narrator talks of words that say they have drank water that quenches all thirst; an unattainable woman

of Coal is an important factor in the growth of these industries 5. Chemicals and Pharma Industry – Several chemical products can be made from the byproducts of coal. Refined coal tar is used in the production of chemicals, such as creosote oil, naphthalene, phenol, and benzene. 6. Coal Gas and Coal Liquid as Transportation Fuel – Present Transportation Industry does not make much use of Coal as Fuel. However, the increasing cost of Oil has made it reasonable to consider converting Coal into Gas and

answers would not change because the bond angles between Cl-C-Cl and H-C-C do not affect the angle of rotation. 7(a) There are seven fluorine environments. 7(b) For a compound a dipole there must be present of partial negative and positive charges. Naphthalene (A) lacks a centre of symmetry (chiral carbon) which is attached to compound or atom with partial negative charge. In compound B, there are two positions of the centre of symmetry. However, the dipole moment canceled each other. In compound C,

Qualitative tests and the analyses of these are done to identify the structure and reaction of each protein to a particular test. There are general and specific tests to be able to identify the different types of proteins clearly and to classify them into groups. General tests include the Biuret and Ninhydrin while for the specific types of tests, these include the Xanthoproteic, Million-Nasse, Hopkins-Cole, Sakaguchi and Lead Acetate. Biuret Test. The Biuret Test is positive for peptide bonds