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1. Brookhaven National Laboratory (BNL) recently constructed the National SynchrotronLight Source II (NSLS-II), which provides the world's brightest coherent x-rays for studying materials and biological systems. Beamline 17-ID-2, the Macromolecular Crystallography Beamline, utilizes x-rays in the energy range 5.0 - 30.0 keV. What range of frequencies and wavelengths does this correspond to?
2. The High-Resolution Powder Diffractometer, beamline BT-1 at the National Institute for Standards and Technology (NIST), utilizes neutrons with a wavelength of 2.079 Å. The mass of a neutron is 1.67×10-27 kg.
a. Calculate the frequency and velocity of the neutrons used in this experiment.
b. Calculate the energy of the neutrons used in this experiment.
c. X-ray techniques are very powerful and often have better resolution than neutron experiments. However, there are sometimes concerns that the high energies associatedwith x-ray experiments can cause damage to sensitive biological samples, and you willoften read arguments that neutron experiments are a "more gentle" means of probing thestructure of sensitive materials. Compare the energy you calculated in part (b) for theNIST neutron diffractometer with the energies in the x-ray crystallography beamline from problem 1. Is this argument reasonable?
The selection of enantiomerically pure (1S)-[endo]-(-)-borneol in the upcoming experiment presents a great opportunity to review some stereochemistry basics
phosgene c12c o has a smaller dipole moment then formaldehyde h2c o even though it contains electronegative chlorine
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A dilute aqueous solution of PtCl4 is pale yellow to colorless, however a concentrated solution is deep red. Explain what explanation can you give for this behavior
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In the laboratory, you dissolve 45.1 g of potassium carbonate in a volumetric flask and then add water to reach a total volume of 375 mL. The molar mass of potassium carbonate is 138.21 g/mol.
When the flask is allowed to cool the vapor condenses and aire again refulls the flask. Re weighing the flask and figure out the the wight of the unknown vapor which filled the flask during the boiling. Explain why it is not necessary to know the w..
which is commonly known as table sugar, reacts in dilute acid solutions to form two simpler sugars, glucose and fructose, both of which have the formula C6H12O6 At 23C
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A solution containing a mixture of metal cations was treated with dilute HCl and no precipitate formed. Next, H2S was bubbled through the acidic solution. A precipitate formed and was filtered off. Then, the pH was raised to about 8 and H2S was ag..
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