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3 Physical Chemistry Questions: 1. Consider treating polyenes, ethylene, butadiene, hexatriene, etc., with the one-dimensional particle-in-the-box model. What length polyene (i.e., number of C atoms) is required to absorb light in the red region of the spectrum? How does that compare with the conjugated portion of carotene? 2. Again using the particle-in-the-box problem, predict in eV the first IP and electron affinity of hexatriene. What temperature would be needed to achieve 10% population of the normally lowest unoccupied molecular orbital (LUMO)? 3. Consider an electron in one, two, and three dimensional boxes with a side of 4 A. How does the zero-point energy vary with increasing dimension?
what is the maximum mass of sucralose (C12H19Cl3O8) you can add to 3.0 kg of pure water and still have the solution freeze? Assume that sucralose is a molecular solid and does not ionize when it dissolves in water
Calculate the volume of concentrated HCL (37% by weight, density 1.19 g/mL) that must be added to 500 mL of .10 M ammonia to make
Calculate the value of E^o cell for the reaction 2Ag(s) + Ca2+ (aq) yields 2Ag+(aq)+Ca(s), using the standard reduction potentials
Calculate the mass of nitrogen dissolved at room temperature in an 78.0 L home aquarium. Assume a total pressure of 1.0 atm and a mole fraction for nitrogen of 0.78.
What is the pH of the resulting hydrochloric acid solution? Part B 0.75g of sodium hydroxide (NaOH ) pellets are dissolved in water to make 4.5L of solution. What is the pH of this solution?
Sodium Carbonate (NaCO3) is available in very pure form and can be used to standardize acid solutions. What is the molarity of the HCl solution if 25.3 mL of the solution is required to react with 0.256 g of Na2Co3
what is the maximum [ATP]/[ADP][Pi] ratio compatible with ATP synthesis assuming that the number of protons trans-located per ATP formed is 2, the temperature is 25C and the change of pH is 0.75?
Carbonic acid is an intermediate step in the transport of CO2out of body. If the pH of blood is 7.4, what percent is carbonic
Assuming this mechanism is correct, which is the rate-determining step if the experimental rate law is first order in nitryl chloride?
Assume also that on a yearly basis the lake is completely mixed, and that the small river flowing into and out of the lake can be neglected as far as acidification is concerned. How many years will it be before the lake will reach a pH of 5.0?
Background: Lake Lianna is fed by two rivers, the Matthew and the Andrew. You have made careful water chemistry measurements throughout the year and found that the two rivers have the following pH and alkalinity
The term solution is synonymous with which of the following. A. compound B. element C. homogeneous mixture D. heterogeneous mixture
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