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A) Describe the roles played by Max Planck, Niels Bohr, Erwin Schrodinger, Paul Dirac, Albert Einstein and Werner Heisenberg in the development of atomic or quantum theory. Which of these people won Nobel Prizes? Use Google to search the names. Limit discussion to a maximum of 200 words. Wikipedia has sufficient information for the purpose at hand.
Positronium consists of an electron and a positron (same mass, opposite charge) orbiting round their common centre of mass. The broad feature of the spectrum are therefore expected to be hydrogen-like, the differences arising largely from the mass..
Make a schematic diagram of a cell for each of the following cell reactions. Indicate on the diagram the anode, the cathode, the direction in which the anions and cations migrate through the cell and the salt bridge
An impure sample of sodium carbonate, (Na2CO3) is allowed to react by dissolving it in an aqueous solution of 0.134 M HCl, according to the following reaction:
the decomposition of solid ammonium carbonate to gaseous ammonia and carbon dioxide is an endothermic reaction. given
The specific rotation, [?]D, for (+)-tartaric acid is +12. What is the observed rotation for a solution of 0.75 g of (+)-tartaric acid in 10 mL of water in a sample tube having a pathlength of 10 cm?
suppose that hydrogen atoms are prepared in the n=2 energy level. calculate the wavelength of light emitted by these excited atoms when returning to the ground state.
What are the most important energy considerations which determine whether or not this compound can be prepared?
a solution is prepared by dissolving 4.21g of a nonelectrolyte in 50.0 g of water. if the boiling point increases by
What NaCl concentration results when 214mL of an .087M NaCl solution is mixed with 517mL of a .250M NaCl solution
What is the balanced chemical reactions that takes place when h2o2, concentrated h2so4, and Cu(s) is placed in solution. One of the byproducts should be copper sulfate (CuSO4) and there is some gas evolution during the reaction.
The osmotic pressure of a aqueous solution of a given polymer with mass concentration 0.300 g/mL is 10.0 torr at 298 K. Estimate the molar mass of the polymer.
A fixed quantity of gas at 22 deg C exhibits a pressure of 754torr and occupies a volume of 5.52L . Calculate the volume the gas will occupy if the temperature is increased to 175 deg C while the pressure is held constant.
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