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Americium-241 is used in smoke detectors. It has a first order rate constant for radioactive decay of k=1.6 x 10^-3 yr^-1. By contrast, iodine-125, which is used to test for thyroid functioning, has a rate constant for radioactive decayof k=.oo1 day^-1.
(a) what are the half lives of these two isotopes?
Using the fact that on the surface of the Earth, where g is constant, 1 kg has a weight of 2.2 lbs, find your mass in kg. C) Convert your height in feet and inches into meters (1 ft = 30.48 cm; 1 in = 2.54 cm).
the reaction of a particular alcohol with a carboxylic acid is 3.83. What is the calculated yield of the ester?
Aromatic Compounds :sample question, Both naphthalene and azulene have 10 pie electrons and are aromatic. Pentalene is apparently antiaromatic and is unstable even at -100 degrees C.
Assuming the final concentration of chloride anion after the addition of hcl (precipitation step) was 0.1M what is the remaining concentration of Ag in the solution
at 210degc a solution of 18.26 g of a nonvolatile nonpolar compound in 33.25 g of ethyl bromide c2h5br had a vapor
State which substance in each of the following pairs you would expect to have the higher boiling point and explain why.
the volume of a gas bag was found to be 840 ml at a temperature of 25 degrees c and a pressure of 734 torr. what would
Calculate the total mass of the neutrons in 19/9F. Use 1.008665 amu as the mass of 1/0N(mass of a neutron). Express your answer in atomic mass units to 7 significant figures. Calculate the mass defect of 19/9F. Use 18.9984 amu as the actual mass o..
In deoxyhemoglobin, Iron atom lies ~0.36 to 0.40 out of the plane of the heme group whereas in oxyhemoglobin it lies of the porphyrine plane. Give reason for this behavious. Talk in terms of coordination number, size and the oxidation state of the..
The molecules CO2 and SCL2 are both of the general molecular type AB2, but one is polar and one is not. Which molecule is polar?
used in high speed centrifuges to separate the parts of a biological cell. How many liters of 3.07 M sucrose contain 245 g of solute?
Solutions, suspensions, and colloids all have solutes interacting with solvents. Which have solute particle diameters below 1,000nm. a. solutions
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