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Silicon has a band gap of 1.1 eV at room temperature.
(a) What wavelength of light would a photon of this energy correspond to?
(b) Draw a vertical line at this wavelength in the figure shown, which shows the light output of the sun as a function of wavelength. Does silicon absorb all, none, or a portion of the visible light that comes from the sun?
Draw the structure of the product that results from the complete reduction of cyclohexanone
A reaction is initiated at 30°C by dissolving 0.2M fructose-1-phosphate in an aqueous solution. When the reaction reaches equilibrium the concentration of fructose-1-phosphate is 6.52 x 10-5M.
Explain what is the pH of 1 liter of a 200mM MES aqueous solution? Require to solve a quadratic equation. Explain how much solid NaOH in grams wants to be added to the MES solution to make a buffer at pH 6.5
Determine the volume of the sample. (b) Plot the data. Now suppose you add another 5.00 mol of gas molecules into the same volume.
cars may be powered by clean H2/O2 fuel cells and electric motors. Under standard conditions, such a fuel cell can develop 1.229 volts. If the oxygen is obtained from air (at P=0.21 bar), what pressure of H2 would be required to develop 1.278 volt..
The heat capacity of water is 4.18 J/g-deg. You may assume that resulting solution of potassium hydroxide has the same heat capacity as that of pure water. The molecular weight of K is 39.1 g/mol
A 3.592 g sample of hydrated magnesium bromide, MgBr2.xH2O is dried in an oven. When the anhydrous salt is removed from the oven, its mass is 2.263 g. What is the value of x
A cylinder containing a mixture of N2 and O2 is taken from the basement to the top of a 50-story building. Assuming that the temperature remains constant, which of the following properties of the gas change during the ascent
assume that the partition coefficient k for partitioning of compound a between diethyl ether and water is 3 that is a
mercury ions hg2 2 can be removed from the solution by precipitation with cl-. suppose that a solution contain aqueous
the water temperature rose from 20.27oC to 26.87oC. If the mass of water surrounding the calorimeter was exactly 1000 g and the heat capacity of the bomb calorimeter was 1.75 kJ/oC, calculate the molar heat of combustion of CH3OH. The specific hea..
The rate constant for a reaction at 40.0 degrees Celsius is exactly 3 times that of 20.0 degrees Celsius. Calculate the Arrhenius energy of activation for the reaction.
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