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What happens to the electronically excited molecule specifically through
photophysical and photochemical processes?
When a molecule is electronically excited, either by absorption of light or through other means, it can undergo both photophysical and photochemical processes.
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- In infrared spectroscopy, the following carbon-hydrogen bonds have peaks at different wave numbers. Explain why this is the caseTrue or False 1. A strong signal in infrared spectroscopy indicates that a molecule matches the emitted electromagnetic radiation and reports a high transmittance. 2. Among all the possible vibrational modes, symmetric stretching will be IR inactive. 3. A hygroscopic organic sample to be subjected to IR does not need to be kept dry because water molecules in the air will not affect the IR spectra.The infrared absorbtion of the N-H stretch in amines occurs approximately at a wavelength of 2.9 x 10-6 m. What is the approximate vibrational force constant, k, of N-H bond? Note: you can assume the reduced mass is equal to the mass of the H atom (which is reasonable since it's attached to a much heavier atom). 48.0 kg/s? 1.20 x 102 kg/s2 7.0 x 102 kg/s2 4.2 x 10-1 kg/s? 1.3 x 103 kg/s?
- Which of the following is true about fluorescence intensity of the molecule? I Fluorescence is observed in planar molecules and its intensity increase with an increase in the number of aromatic rings II When zinc is added to a hydroxyl quinoline solution the fluorescence intensity increased due to the formation of a complex which increases the rigidity of the molecule. III On increasing the intensity of the incident radiation the fluorescence intensity increases IV On increasing the concentration of the fluorigenic molecule, the fluorescence intensity increases. A plot of intensity vs concentration exhibita linear relation indefinitely in all concentration ranges. O a. II,III,IV O b. 1,11,1II,IV O. I,II,III O d. II,I,IV O e. I,II,IVOrganic Chemistry: IR spectroscopy A student obtains an IR spectrum with an intense, broad absorption at about 3350 cm-1. The student claims that the sample is an alcohol, but the professor says that the absorption is there because the sample is contaminated with water. What peak(s) could be looked for to show that the sample is indeed an alcohol? Which functional groups would make it difficult to use this strategy?What is qrxn? -3661 J -146.4 J +146.4 J +3661 J
- Draw a three-dimensional representation of the oxygen-bearing carbon atom in ethanol, CH3CH2OH, using the standard convention of solid, wedged, and dashed lines.A student has acquired an IR spectra of an unknown six-carbon molecule and has determined that it is either 2-hexyne, 1- hexyne, or 1-hexene. How can the student use their knowledge of IR spectroscopy to determine the identity of the molecule? In your answer, clearly specify what regions of the IR spectrum the student should look at and what bonds are responsible for the absorption bands you indicate.The naphthalene molecule has a structure that corre- sponds to two benzene molecules fused together: The ™ electrons in this molecule are delocalized over the entire molecule. The wavelength of maximum absorption in benzene is 255 nm. Will the corresponding wavelength in naphthalene be shorter or longer than 255 nm?
- A certain molecule contains one H atom and one CI atom a symbolic domainOrder the following carbon-carbon bonds in order of increasing vibrational frequency (lowest to highest in cm-1) I C=C 0 0 0 0 | < ||| < || || < ||| < | || < | < ||| ||| < || < | II C-C III C=Cwhat are the vibrational bands of ASA?