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A patient is given 0.050 mg of technetium-99m where m means metastable- an unstable but long lived state), a radioactive isotope with a half-life of about 6.0 hours. Explain how long until the radioactive isotope decays to 6.3 * 10-3 mg?
In 2008, China's tainted milk scandal spreaded around the world. This major issue is caused by the melamine-contaminated milk products. Shortly after, enzyme immunoassay (EIA) was developed to measure very small quantity of melamine level. What is..
What is the de Broglie wavelength of a flea midway through its jump? Assume the mass of the flea is4.50×10-4 g and t is moving at 1.00 m/s.
Using standard enthalpies of formation, calculate the change in enthalpy for the following reaction: 2C6H6 + 15O2 = 12CO2 + 6H2O. How many grams of C6H6 must be combusted in the above reaction to produce 2570 kJ of heat energy
3 5L flasks fixed with pressure gauges and small valves, each contain 4 g of gas at 273K. Flask A has H2, B has He and C has CH4. Place in order of pressure
For each titration I need to calculate the moles of base needed to neutralize the acid sample. How do I go about doing this?
Calculate the sulfide ion concentration in a saturated solution of hydrogen sulfide with a pH of 0.85. Assume that [H2S]=0.10 mol/L in a saturated solution. Write the overall, balanced net ionic equation for the ionization of hydrogen sulfide
At 570. mm Hg and 25C, a gas sample has a volume of 2270 mL. What is the final pressure (in mm Hg) at a volume of 1250 mL and a temp of 175C?
An amount of H2O vapor (gas) is condensed isothermally and reversibly to liquid water at 100ºC where it occupied a volume of 838 cm3. The standard enthalpy of vaporization of water at 100ºC is 40.66 kJ mol-1, the density of liquid water at 100ºC i..
Calculate q when 15.8 g of ice is cooled from -22.4 degrees Celsius to -71.0 degrees Celsius (C ice = 2.087 J/g*K)
question phosphorylation can also serve to activate or inactivate specific enzymes. give an example of one amino acid
(a) When 1.50 mol of Al and 3.00 mol of Cl2 combine in reaction 2 Al(s) + 3 Cl2(g) -----> 2 AlCl3(s), which is the limiting reactant. (b) How many moles of AlCl3 are formed. (c) How many moles of the excess reactant remain at the end of the reacti..
magnesium ion solution and another electrode composed of silver in a 1.0 M silver ion solution, connected by a salt bridge. Calculate the standard potential for this cell at 25 °C. Standard reduction potentials
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