Carbon dioxide and water are important greenhouse gases. Sketch the fundamental vibrations for both molecules and indicate which you expect to be infrared active.
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Carbon dioxide and water are important greenhouse gases. Sketch the fundamental vibrations for both molecules and indicate which you expect to be infrared active.
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- What effect does the ozone layer have on the EM waves from the sun? What is currently threatening the ozone layer? Describe the greenhouse effect occurring in Earth's atmosphere? I1. Between Pentafluoroethane (C2HF5) and Difluoromethane (CH2F2), which molecule has the most asymmetrical vibration and which one will absorb the most infrared radiation? Explain. 2. Based on the first question, which is the stronger greenhouse gas?SO2 is not actually a significant greenhouse gas, while SF6 is. Explain this difference by commenting on their expected behaviour in the atmosphere. (What will happen or not happen to each gas after it is emitted?)
- (i) Estimate the energy for breaking the bonds of CFC-11 and CFC-12 to form the chlorine radical (Cl). (ii) Determine the wavelength of a photon necessary to photolyze CFC-11 and CFC-12. (iii) Discuss the possible fates of chlorofluorocarbons (CFCS) in the atmosphere.2. Molecules absorb IR radiation consistent with vibrational energy and rotational energy. Which of these is present in condensed phases (liquid, solution, solid)?Consider the following Greenhouse Gases (GHG's): Sulfur hexafluoride, carbon dioxide, and trifluoromethane (a hydrofluorocarbon). Using the concepts of asymmetrical stretching and infrared absorption, rank the gases from weakest to strongest greenhouse gas, and explain your ranking that CH4 is a stronger GHG than CO2). HINT: Consider ö=c=ö carbon dioxide sulfur hexafluoride trifluoromethane
- Why are oxygen and nitrogen not greenhouse gases? Which gases are greenhouse gases?In regard to the greenhouse effect, which statement is not true? (a) Ultraviolet and visible radiation are converted to infrared radiation at the surface of Earth. (b) Approximately one-third of the radiation of the Sun does not enter the atmosphere of Earth. (c) Infrared radiation is absorbed by greenhouse gases. (d) Greenhouse gases were not historically present in the atmosphere. (e) Ultraviolet radiation is absorbed by ozone.Why is it important to decrease the level of greenhouse gases in the Earth’s atmosphere?
- what is the lewis dot structure of an excited nitrogen?Enrico Fermi (1901–1954) was a famous physicist who liked to pose what are now known as Fermi problems, in which several assumptions are made in order to make a seemingly impossible estimate. Probably the most famous example is the estimate of the number of piano tuners in Chicago using the approximate population of the city and assumptions about how many households have pianos, how often pianos need tuning, and how many hours a given tuner works in a year. Another famous example of a Fermi problem is "Caesar's last breath," which estimates that you, right now, are breathing some of the molecules exhaled by Julius Caesar just before he died. The assumptions made are: 1. The gas molecules from Caesar's last breath are now evenly dispersed in the atmosphere. 2. The atmosphere is 50 km thick, has an average temperature of 15 °C, and an average pressure of 0.20 atm. 3. The radius of the Earth is about 6400 km. 4. The volume of a single human breath is roughly 500 mL. Perform the…Be sure to answer all parts. Covalent bonds in a molecule absorb radiation in the IR region and vibrate at characteristic frequencies. (a) A molecular vibration absorbs radiation of wavelength 28.3 um. What frequency (in s) corresponds to that wavelength? Enter your answer in scientific notation. x 10 (b) A molecular vibration has a frequency of vibration of 7.574 x 10" Hz. What wavelength (in um) corresponds to that frequency? um