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Calculate the wavelength in nm of light (Hz) illuminating a sodium surface if the threshold wavelength of sodium is 544 nm and the kinetic energy of the electron emitted is 3.00 × 10-19 J. Express answer in scientific notation.
Which protein(s) will bind tightly to CM Sephadex (a cation exchange resin) if loaded onto the column in a sample buffer whose pH is 7.0
a mixture of 0.47 mole of H2 and 3.59 moles of HCl is heatedto 2800 degrees C. Calculate the equilibrium partial pressures of H2, Cl2,and HCl if the total pressure is 2.00 atm. For the reaction:
You are given an unkown acid H2A, which has two acidic protons per molecule. A 0.954-gram sample of this acid is titrated with .509M NaOH; complete neutralization of the acid requires 36.04mL of base, Find the molar mass of H2A.
If oxygen gas were collected over water at 22 C and the total pressure of the wet gas were 650 mm Hg, what would be the partial pressure of the oxygen?
If a space probe weights 39,200 N on the surface of earth, what will be the mass of the probe on the surface of mars.
A chemist wants to prepare 0.65 M HCl. Commercial hydrochloric acid is 12.4 M. How many milliliters of the commercial acid does the chemist require to make up 1.48 L of the dilute acid?
What is the approximate ratio of the molar concentrations of CO_2(aq) in the soda before it is opened to that in the soda after it has been opened and reached equilibrium with the surrounding atmosphere
Write the structural formulas for the products that form when 1-butene reacts with each of the following reagents: a) HI b) H2, Pt c) Dilute H2SO4, warm d) Cold concentrated H2SO4
What quantity of heat is required to vaporize 151 g. of benzene C6H6 at its boiling point 80.1 degrees celsius? Heat of vaporization = + 30.8 kj/mol.
What is the frequency of the photon emitted when a molecule of NaH drops from the second to first level?
What is the pH of the solution created by combining 2.90 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)?
How many hours are required for .235 mol of electrons to flow through ta circuit if the current is 1.68 A
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