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Let us model a pi-electron in a tyrosine, by assuming it is a particle trapped in a 2-dimensional square box. As you should know, the maximum of absorption is at about 280nM. Calculate the approximate size of the box used to model the tyrosine ring. Is this a reasonable model for the system?
(Hint: Provide an expression for the quantized energy levels of the electron and calculate the lowest energy corresponding to transition from the ground state to the excited state).
write the expression for the base dissociation constant for hydrazine, N2H4, a weak base. Hydrazine reacts with water to form the N2H5+ ion.
A water sample is analyzed for a pollutant by the standard addition method . four solutions are prepared,each with a 10.00 ml aliquot of the water sample and varying amounts of a 10 ppm standard solutions of the pollutant
What is the pH of the solution created by combining 8.00 mL of the 0.10 M base with 8.00 mL of the 0.10 M acid?
when 0.500 l of a 2.00 m solution of Pb(NO3)2 is mixed with an excess of 1.00m solution of Ki, how many grams lead (II) iodide are formed? ( molar mass: Pb(NO3)2= 331 g;KI 166g; PbI2 =467 g; KNO = 101 g
Calculate the approximate SO 2 mass emission in lb/day.
List all the ionic species present (before any reaction occurs) when the following solutions are mixed together
Use Lewis structures and bond energies to calculate the enthalpy change of the following reaction: HCN(g) + 2H2(g) => CH3NH2(g) a. 158 kJ b. -158 kJ c. -590 kJ d. 590 kJ e. none of these
a 2.0l kettle contains 116g of boiler scale caco3. how many times would the kettle have to be compleletly filled with
question the combustion of liquid ethanol c2h5oh produces carbon dioxide and water. after 5.6 of ethanol density 0.789
What is the freezing point of a solution prepared from 50.0 g ethylene glycol (C2H6O2) and 85.0 g H2O? Kf of water is 1.86°C/m.
A cylindrical vessel with rigid adiabatic walls is separated into two parts by a frictionless adiabatic adiabatic piston. Each part contains 50.0L of an ideal monatomic gas with Cv = 3R/2. Initially, Ti = 325K and Pi = 2.50x10^5 Pa in each part.
Rank each of the following compounds in decreasing order of reactivity towards Friedel-Crafts alkylation. Most reactive = 1; if a compound will not react, rank it as "non" rather than assigning a numerical value.
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