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A metal whose threshold frequency is 8.22×1014 s^-1 emits an electron with a velocity of 6.59×105 m/s when radiation of 1.12×1015 s^-1 strikes the metal. Can you show me how you got the answer?
sand and iron particles that are similar in size and color are mixed together in a beaker. what would be the best method of separating the particles?
1.calculate the mass of oxygen dissolved in a 70.0 l aquarium maintained at room temperature. the total pressure is
A compressed nitrogen cylinder from Praxair has a volume of 43.0L and a maximum pressure of 2265 psi. Assuming that the temperature is 293K
Choose the selection which correctly characterizes all three of the following substances in terms of whether they are polar or nonpolar: IF and NCl3 and SiF4
The Lyman series of emission lines of the hydrogen atoms are those for which nf = 1. a) determine the region of the electromagnetic spectrum in which the lines of the Lyman series are observed. b) Calculate the wavelengths of the first three lines..
The pH of a 0.010 mol L-1 solution of a weak monoprotic acid is 2.09 at 25oC. What is the pKa for this acid
95.0 g of 0.0 degree C ice is added to exactly 100.g of water at 60.0 degree C. When the temperature of the mixture first reaches 0.0 degree C, the mass of ice still present is
A 2.000-L flask was filled with 0.0393 mol SO2 and 0.0197 mol O2. At equilibrium at 907 K, the flask contained 0.0299 mol SO3. How many moles of each substance were in the flask at equilibrium?
What is the relationship between (dynamic) viscosity and kinematic viscosity for Newtonian materials?
Calculate the standard reaction enthalpy for the following reaction. N2H4(l) + H2(g) -----> 2NH3(g) Given: N2H4(l) + O2(g) -------> N2 (g) + 2H2O(g)
A phosphate buffer solution (25.00 mL sample) used for a growth medium was titrated with 0.1000 M hydrochloric acid. The components of the buffer were sodium monohydrogenphosphate and sodium dihydrogenphosphate
With a solution in them connected by a liquid salt bridge junction filled with KNO3. In one solution you have a graphite electrode that is connected with a wire to a copper electrode in the second soution. The soution in contact with the graphite ..
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