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In his explanation of the threshold frequency in the photoelectric effect, Einstein reasoned that the absorbed photon must have the minimum energy required to dislodge an electron from the metal surface. This energy is called the work function of that metal. What is the longest wavelength of radiation (in nm) that could cause the photoelectric effect in each of the following metals? a. Silver, (work function) = 7.59 x 10 -19 J ? nm b.Tungsten, (work function) = 7.16 x 10 -19 J ? nm c. Sodium, (work function) = 4.41 x 10-19J ?nm
Calculate the cost in free energy to move 1mol K+ through the cell wall by active transport. Assume no change in K+ concentrations during this process.
While in Europe, if you drive 109 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 29.0 mi/gal? Assume that 1euro=1.26 dollars.
A compound A(C6H6) undergoes catalytic hydrogenation over lindlar catalyst to give a compound B, which in turn undergoes ozonolysis followed by workup with aqueous H2O2 to yield succinic acid and two equivalents of formic acid.
Describe how you prepare 5.00 times 10^2 mL of 0.7 M CuSO4. How many grams of CuSO4 are needed. How many significant figures are used for the mass. What type of container should it be made up in.
the heat of combustion of c10h18 is -6286 kj/mol. the heat of combustion for c10h8 is -5157kj/mol.
Metals such as magnesium and zinc react with dilute sulfuric acid to give hydrogen, according to the equation: M (s) + H2SO4 (aq) -------> MSO4 (aq)
Oxygen difluoride, OF2, is a colorless, poisonous gas that reacts rapidly with water vapor to produce O2, HF, and heat. OF2(g) + H2O(g) --> 2HF(g) + O2(g) + 324.4 kJ
A 12 liter tank contains helium gas pressurized to 160 atm. What size tank would be needed to contain this same amount of helium at 1 atm
Treatment of an aldehyde or ketones with hydrazine, H2NNH2, yields an azine, R2C=N-N=CR2. Propose a mechanism
Complete the following reactions. Draw structural formula for each reaction. In each case state the type of reaction that is occurring.
The balences in the lab can weigh a maximum of 220.000 g at once. if a beaker has a mass of 86.4329 g, what is the maximum volum of water
sunlight with a wavelength greater than 240nm. What is the energy available for the dissociation of molecular oxygen at 200nm?
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