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Strontium-90 and radon-222 both pose serious health risks. Sr-90 decay by beta particle production and has a relatively long half-life (28.9 years). Radon-222 decays by alpha particle production and has a relatively short half-time (3.82 days). Explain why each decay process poses health risks.
Standard reduction potentials for the Pb2+/Pb and Cd2+/Cd haf-reactinos are -.13V and -.40C, respectively. At what relative concentrations of Pb2+ and Cd2+ will these half-reactions have the same reduction potential?
During the course of an experiment, a 0.300 M NaCl solution with an initial volume of 25.0 ml is diluted to a total final volume of 26.0 ml. What is the concentration of NaCl in the final solution?
7.39 mmol of base was used when titrating 432 mg of a monoamine monocarboxylic amino acid from pH 0.8 to 12.0. What is the name of the amino acid
Consider an insulated system containing 150 g of liquid water and 150 g of ice at equilibrium under atmospheric pressure. A total of 22 g of steam at 120±C is admitted to the system.
for 1st order problem, at 298k the rate is 3.8X10^-6M/s, and at 350k the rate is 4.2X10^-5 M/s. What is the half life at 360k?
A saturated solution of magnesium hydroxide in equilibrium with undissolved solid is prepared at 25C. The pH of the solution is 11.03. Calculate the value of the Ksp
a. A 0.1044 gram sample of an unknown monoprotic acid required 22.10 mL of 0.0500 M NaOH to reach the end point. What is the molar mass of the unknown?
You need to produce a buffer solution that has a pH of 5.10. You already have a solution that contains 10 mmol (millimoles) of acetic acid.
Draw the Newman projection for the most stable conformation of (2R,3S)-2,3-dichloropentane.
Cadmium ion in solution is analyzed by precipitation as the sulfide, a yellow compound used as a pigment in everything from artists' oil paints to glass and rubber. Calculate the molar solubility of cadmium sulfide at 25?C ?
What is the molar mass of butane, C4H10? Express your answer to four significant figures and include the appropriate units. Value and units
Bones vary in mechanical properties. Where on the range of mechanical properties for bone do you think this bone would fall? Address at least elastic modulus, yield stress, and yield or ultimate strain.
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