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A certain minimum energy(E min) is required to eject an electron from a photosensitive surface. Any energy obsorbed beyond this minimum gives kinetic energy to the ejected electron. When 540-nm light falls on a cesium surface, an electron is ejected with a kinetic energy of 6.69 X 10 ^-20 J. When the wavelength is 400 nm, the kinetic energy is 1.96 X 10 ^-19 J.
A) Calculate the minimum energy (E min) for cesium, in joules.
B) Calculate the longest wavelength, in nanometers, that will eject an electron from cesium.
Calculate the mass percent of a solution that is prepared by adding 35.9 gram of NaOH to 30.2 g of H2O.
Brass has a specific heat capacity of 0.393 Joules/g C. A paperweight weighing 129g is heated to 95.0 C. Then it is added to 44.6g of water in a calorimeter having a temperature
You add 1.00 g of a solid weak acid to 100 mL of water, then titrate with 0.100 M NaOH solution. The pH at the half equivalence point is 4.22. Which of the acids in the Weak Acid Equilibrium Constant table most likely matches your unknown?
A 129-mL portion of that solution is diluted by adding 121 mL of water. What is the final concentration? Assume the volumes are additive.
the mineral greenockite is a yellow sulfide of cadmium that is 78.0% cadmium and 22.o% sulfer. determine the emipirical formula of greenockite.
How many grams of Na3PO4 is needed to produce 575mL of a solution that has a concentration of Na+ ions of 1.50M?
What is the product in a base catalyzed aldol condensation reaction between: 2 mmols acetone and 8 mmols benzaldehyde? 2 mmols acetone and 8 mmols 4-methylbenzaldehyde
Give the products you would expect and the mechanism involved for the reaction of 1-bromopropane with:a. Water
The mass of a cube of iron is 324 g. Iron has a density of 7.87 g/cm3. What is the mass of a cube of lead that has the same dimensions?
suppose that cells are grown on amino acids that have all been labled with 13C at the alpha carbons. identify the atoms in cytosine and guanine that will be labled
You have 47.2 mL of a solution of copper(II) chloride (CuCl2?). You need to determine the concentration of Cu2+ in the solution gravimetrically.
A sample containing 4.80 g of O2 gas has a volume of 15.0 L. Pressure and temperature remain constant. What is the new volume if 0.500 moles of O2 gas is added?
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