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Cadmium selenide, CdSe, is utilized as a photoconductor in lightmeters. The band gap is about 1.74 eV. Explain what is the longest wavelength of light that can promote an electron from the valence band to the conduction band in cadmium selenide? Nanoparticles of CdSe exhibit luminescence with a color dependent upon their size. Explain why does the wavelength of light emitted by CdSe nanoparticles shift from red to green as particle size is reduced? Explain what is this phenomena called?
Carbon dating is a well-calibrated radiometric dating system used for items generally younger than 50,000 years old (14 C has a half-life of 5730 years).
Which of the following concentration measures will change in value as the temperature of a solution changes
what concentration in ppm would it constitute? The effective volume of the earth's atmosphere is about 4.2 billion km^3, and take the average pressure to be 550 mm Hg and the average temperature to be -10 degrees C. The molar mass of air is 29 g/m..
6NO2+2H2O=4(HNO3)+2NO. For this equation, how many grams of nitrogen dioxide are needed to react with 3.70mol of H2O? How many grams of nitrogen monoxide are produced when 2.18mol of H2O react?
Find the expression for the reversible pressure-volume work of an isothermal van der Waals gas with a constant number of moles (integrate the expression fully from Vi to Vf)
How many grams of HCl are in a quart of muriatic acid? The muriatic acid density is 1.18 g/mL and is typically 36.5% HCl by mass.
potassium chloratedecomposed when heated to produce potassium chloried and oxygen gas. if 2.50 grams od kclo3 were
Define what is the product for Benzene + (benzene ring attached to a carbon which is single bonded to another carbon which is double bonded to an oxygen and single bonded to a Cl) all in the presence of a ALCL3 catalyst
If the purity of compounhe Z is 87% and the reed value for its molar extinction coefficient is 9200M-1 cm-1 at 605nm. What should measure as the E of this impure compund Z
Calculate the final temperature of 37 mL of ethanol initially at 11 degrees C upon absorption of 624 J of heat. (density of ethanol =0.789 g/mL).
What is the rate of reaction when the initial concentrations of NO and O2 are 0.030 M and 0.025 M, respectively? 2 NO(g) + O2(g) --> 2 NO2(g)
Water with an alkalinity of 2.00 X 10^-3 equivalents/L has a pH of 7.00. Calculate [CO2], [HCO3-], [CO3^2-], and [OH-].
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