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1. If you consider an orange LED and create a set of energy levels (i.e. the energy level diagram of a semiconductor) that is consistent with the observed spectrum of the diode, you would obtain a diagram similar to the one shown below. For this energy level diagram, use the energy axis (in J) to determine the minimum energy separation between the valence band and the conduction band. This is the bandgap energy. Record this value as the bandgap energy (in J) and calculate the wavelength of light associated with the transition (in nm).
2. In your laboratory notebook, draw an energy diagram for a semiconductor, which is similar in style to the one given in question 3 (but you will change the specific transition). Then on this one energy diagram, draw to scale the transitions showing the absorption of a blue-green photon (4.0×10-19 J) and the fluorescence (emission) of a red photon (3.0×10-19 J). Make sure to adjust the energy diagram (i.e. the single conduction band and the single valence band) on the scale to represent the magnitude of the photons in this question.
The next three (3) problems deal with the titration of 331 mL of 0.501 M carbonic acid (H2CO3) (Ka1 = 4.3 x 10-7, Ka2 = 5.6 x 10-11) with 1.5 M KOH.
Calculate the empirical formula for a chemical compound which gives the following analysis: 65.2 g scandium and 34.8 g oxygen.
Aluminum metal is made industrially by electrolysis of Al2O3 dissolved in molten Na3AlF6. How many grams of Al metal are produced when 8.80 X 103 coulombs pass through the cell?
During steel formation, why do the following reactions cause the temperature in the converter to increase?
At 70K, CCL4 decomposes to Carbon and Chlorine. The Kp for the decomposition is 0.76. Find the starting pressure of CCl4 at this temperature that will produce a total pressure of 1.1 atm at equilibrium.
If the ratio [HbCO]/[HbO2] comes close to 1, death will happen. What partial pressure of CO is fatal. Assume the partial pressure of O2 is 0.20 atm (since air is 20% O2).
Write a balanced equation for each of the two steps of the reaction, namely: (1) the reaction between benzyltriphenylphosphonium chloride and sodium hydroxide
indicate whether aqueous solutions of each of the following solutes will contain only ions, only molecules, or mostly molecules and a few ions: a) NH4Cl, a strong electrolyte. b)ethanol, CH3-CH2-OH, a nonelectrolyte. c)HCN, hydrocyanic acid, a wea..
The atomic weight of a newly discovered el- ement is 110.352 amu. It has two naturally occuring isotopes. One has a mass of 111.624 amu.
Calculate oxalate ion in the resulting solution. volume change is negligible Calculate the Kb for the reaction that occurs when solid sodium oxalate is dissolved in water
The average kinetic energy of the molecules in a gas sample depends only on the temperature, T. But given the same kinetic energies, a lighter molecule will move faster than a heavier molecule.
The mass spectrum of an organic compound shows the relative abundances of M to be 60.70% and M 1 to be 15.76%. Assuming the peaks are caused by 12C and 13C isotopes, determine the number of carbon atoms in the compound.
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