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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 rate constant increases by a factor of 2.00 when the temperature is increased from 80 C to 115 C. estimate the arrhenius activation energy.
List the following compouns from highest to lowest frequency.
Write the balanced neutralization reaction between H2SO4 and KOH in aqueous solution. .150 L of .430 M H2SO4 is mixed with 0.100 L of .230 M KOH. What concentration of sulfuric acid remains after neutralization
What is the FORMULA for the limiting reagent? What is the maximum amount of carbon dioxide that can be formed in grams? What amount of the excess reagent remains after the reaction is complete in grams?
the Grignard reagent containing more carbon atoms with the carbonyl compound containing less carbon atoms and scheme two involves the reaction of the Grignard reagent containing less carbon atoms with the carbonyl compound containing more carbon a..
Since the periodic table currently has 7 periods (and will have 7 until element 119, which will be the first element of the 8th period, is "discovered"), consider the electron shell with principle quantum number, n = 7.
Using a sample of water with a mass of 46.0 grams at a temperature of -58. Degree Celsius calculates how many Joules of energy (E) are necessary to heat the ice to 0 degree Celsius. Specific heat of ice= 2.1 J/g C).
If 158 mL of wet H2 is collected over water at 24C and a barometric pressure of 737 torr, how many grams of Zn have been consumed?
What mass of oxygen will be dissolved in the water? The temperature of the water is 58 C, KH (02)=.00141 M/atm, and the mole fraction of oxygen gas in .23
electrode composed of nickel in a 1.0 M nickel(II) ion solution and another electrode composed of silver in a 1.0 M silver ion solution, connected by a salt bridge. Calculate the standard potential for this cell at 25 °C.
High-pressure liquid chromatography (HPLC) is a method used in chemistry and biochemistry to purify chemical substances. The pressures used in this procedure range from around 500 kilopascals (500,000 Pa) to about 60,000 kPa (60,000,000 Pa)
Assume that you carry out the reaction with 25.0 gr of cyclohexane (limiting reactant). What is the theoretical yield of adipic acid. If you obtain 33.5 gr of adipic acid, what is the % yield for the reaction
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