sulfate‚ remove the magnesium sulfate by vacuum filtration and remove the pentane from the filtrate by evaporation on a water bath in the hood. The percent recovery from cloves will be determined and the product will be analyzed by transmission infrared spectroscopy (IR). Oil of cloves‚ which consists almost entirely of eugenol and its acetate‚ is used in perfumeries‚ flavorings‚ essential oils and in medicine (local antiseptic and analgesic). Reaction: See flow chart attached Data and observation
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Identification of Unknown Organic Compounds by Melting Point‚ Boiling Point‚ and Infrared Spectroscopy Methods and Background The goal of this laboratory experiment was to determine the structure and identity of an unknown solid and an unknown liquid by using elemental analysis‚ index of hydrogen deficiency‚ infrared spectroscopy‚ melting point (for solid)‚ and boiling point (for liquid). In this laboratory‚ we were given unknown solid “C” and unknown liquid “D”. The empirical formula
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using infrared spectroscopy? A. Stretching and bending B. Rotation and excitation C. Spin flipping D. Fragmentation 2. The functional group region of an infrared spectrum is A. where the cations appear. B. >1500 cm-1. C. <1500 cm-1. D. >2500 cm-1. 3. Stronger bonds will be found where in the infrared spectrum? A. Higher molecular weight B. Lower molecular weight C. Lower wavenumbers D. Higher wavenumbers 4. Compared to a C-H bond‚ a C-D bond will vibrate where in the infrared spectrum
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CH 202 Breakdown UV/Vis: Molecules containing π-electrons or non-bonding electrons (n-electrons) can absorb the energy in the form of ultraviolet or visible light to excite these electrons to higher anti-bonding molecular orbitals. The more easily excited the electrons (i.e. lower energy gap between the HOMO and the LUMO)‚ the longer the wavelength of light it can absorb. Conjugation raises the energy of the bonding orbitals and lowers the energy of the antibonding molecular orbital. This
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Johns Hopkins University He wrote many articles on spectroscopy‚ phosphorescence and diffraction. He is best known for his work in ultra-violet light. Wood has been described as the "father of both infrared and ultraviolet photography" because of the discovery of electromagnetic radiation beyond the visible spectrum and the development of photographic emulsions. He was the first to intentionally produce photographs with both infrared and ultraviolet radiation. He also coined the slightly
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April 20‚ 2013 TITLE: Structure Elucidation of Organic Compounds Using Infrared Spectrometry and Computer Molecular Models. OBJECTIVES: Using the Spartan Student v5.0.0. Software in computer‚ determine the absorption frequencies of C=O str.‚ C-H str.‚ and C-H bend in the following molecules: 1. Benzaldehyde 2. Ethyl Benzoate 3. 3-Pentanone 4. Pentanal * For given unknown Infrared spectra‚ figure out the compounds based on the absorption frequencies of
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(FIGURE-4) In order to tell how much borneol is formed during reactions‚ both qualitatively and quantitatively‚ infrared spectroscopy and gas chromatography are executed on the products formed from Sodium Borohydride Reduction and Meerwein-Ponndorf-Verley Reduction (MPV). Infrared (IR) spectroscopy shows the relative absorption of specific chemical bonds in a molecule to the induced infrared radioactive energy. Thus from looking at the peaks on IR spectrum‚ possible functional groups in a compound
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flask and weighed. Calculated the weight-percent recovery of the oil from the original amount of cloves used. Then‚ we determined the infrared spectrum of the oil. Results‚ Data‚ Calculations Weight of empty boiling flask: 32.022g Weight of flask with oil: 33.651g Eugenol oil: 1.632g Watch glass weight: 50.288g Cloves: 7.011g %
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Abstract Pigments extracted from different greens have different polarities and may be different colors. Mixed pigments can be separated using chromatography paper. Chromatography paper is able to separate mixed pigments due to their polarity and solubility. Pigments of chlorophyll a‚ chlorophyll b and beta carotene will be separated on chromatography paper because each has its own polarity and solubility‚ which results in different distance traveled up the paper. Beta carotene is non-polar so it
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and Castellucci 2000). Examples are the introduction of lasers‚ Fourier transform (FT) Raman‚ charge-coupled device (CCD) detectors‚ confocal Raman spectroscopy and fiber-optics‚ that allowed conservation scientists to record molecular spectra of minute samples or directly from the art object. Case study Red pigment samples were collected from the early Christian necropolis of El-Bagawt at Kharga Oasis‚ Egypt. El-Bagawat necropolis is dating back to the 4th century AD. Two of the most outstanding
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