Impurity

INTRODUCTION The purpose of this experiment was to demonstrate the stereochemistry of the electrophilic addition using (E)-Stilbene, a trans-isomer of ethylene. Bromine was added and reacted with (E)-Stilbene to form an alkene. A product was made with both a meso-stilbene dibromide and a d/l-stilbene dibromide, which is trans-stilbene dibromide. DISCUSSION AND CONCLUSION For the reaction to form these two different compounds with the same starting reactants, the double bond of (E)-Stilbene…

Nwizu Chidinma Precious Juliana Rodriguez Jade Mancini A boil, also called a furuncle, its a deep folliculitis, infection of the hair follicle. It is most commonly caused by infection by the bacterium results to a painful swollen area on the skin caused by an accumulation of pus and dead tissue. Boils are filled with pus. Boils clustered together are called carbuncles. Boils are bumpy, red, pus filled lumps around a hair follicle that are tender, warm, and very pain, they are the sizes of pea or…

was 0.086 grams. The melting point was 82.9 °C – 84.5°C. According to PubChem, the melting point of benzocaine is 92 °C. The reason why the experimental melting point was lower than the literature melting point could because there might have been impurities in the benzocaine that was obtained experimentally. The melting point range was 1.6. The percent yield was 59.3%.…

exemplified in trade unions and other associations that consist of cooperating members from all castes. Among crowds in urban public spaces and on public transportation, it is impossible to distinguish members of different castes, and purity and impurity rules have no significance (Waughray, 328). Restrictions on interactions with other castes have started to reduce and, at the same time, observance of other rules have started to decline. As new working opportunities arise in urban areas, the…

Vaccination is the process of injecting antigenic material to stimulate immune response. Conventional vaccines insert attenuated or killed infectious agent, such as virus or antigenic protein, into the body to stimulate immune system to develop immunity against the pathogen. However, this type of vaccines has some weakness. For example, attenuated virus may suddenly become very active in the body and cause disease instead of stimulating immune response. Conventional vaccines also unable to…

4. Analysis of Traditional Chinese Medicines (TCM) [26] The identification and quantification of components of traditional TCM by chromatographic analysis (HPLC) is one of the major challenge. As TCM is a complex matrices in which all the constituents plays specific role for the overall efficacy. So the analysis of all the constituents synchronously is necessary to quality control the TCM. So the new technique UPLC is used for the quality control of the TCM. 5. Multi-residue analysis of…

insoluble impurities while the solution is hot; crystallizing the purified compound, and isolate the pure compound by vacuum filtration . The unknown used in the experiment was #4, which were white crystals. In order to determine the ideal solvent we prepared two test tubes. Test tube #1 containing 0.106g of unknown and 3mL of water, it was well mixed. At room temperature water dissolved a small amount of the solute while boiling hot it was able to dissolve the solid but some impurities…

experimental melting point of Acetyl Ferrocene is 82-85°C, whereas the literature melting point is 85-86°C. The slight deviation can be one of two reason, either when the melting point was conducted the product was still slightly moist or that there are impurities present in the final product. The theoretical yield for the experiment is 0.114 g, but the actual yield is 0.055 g making the percent yield 58%. The TLCs that were conducted help keep track of the reaction because identify what…

religion. The Scarlet Letter- The scarlet letter promotes the impure act of adultery. The red stands as a symbol of sin and evil. It could also mean that Hester can burn in hell for her impurity. The Scarlet Letter- In chapter 13, the scarlet letter is not really mentioned so much as a symbol of impurity, but as a symbol of her calling. With all of her charity work, people began to ignore the origin of the scarlet A, but beginning to call it a sign of Abel. Abel- Abel is a character in the…

shameful thing, but another side to being human. In my original argument, Geraldine symbolized impurity and evil. However, when Christabel first sees her, one wouldn't think that she did, “There she sees a damsel bright,/Drest in a silkin robe of white”, (60-61). Geraldine is first introduced draped in a beautiful silk robe, with such a costume, nobody would think that she represented a sexuality and impurity. White is always the color that symbolizes purity and yet in this poem, it is…