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The "colbalt treatments" used in medicine for arresting certain types of cancer rely upon the ability of gamma rays to destroy canercous tissues. Cobalt-60 decays with the emission of Beta particles and gamma rays, with a half life of 5.27 years. How much of a 4.78 microgram sample of Co-60 remains after 30 years?
1. 0.1098 micrograms remains after 30 years
2. 0.1067 micrograms remains after 30 years
3. 0.0925 micrograms remains after 30 years
4. 0.0832 micrograms remains after 30 years
5. 0.0667 micrograms remains after 30 years
A sample of commercial concentrated hydrochloric acid is 11.8 M HCl and has a density of 1.190 g/mL. Calculate (a) the mass percentage, (b) molality and (c) mole fraction of HCl in concentrated hydrochloric acid.
If 30.00 mL of 0.500 M KOH are needed to neutralize 10.00 mL of HCl of unkown concentration, what is the molarity of the HCl
When an amino acid is dissolved in a buffer solution, the pH of which is less than the isoelectric point of that amino acid, and an electric current is passed through the solution
How many grams of dry NH4Cl need to be added to 2.50 L of a 0.700M solution of ammonia, NH3, to prepare a buffer solution that ahs a pH of 8.61?
You have 100.0 mL of a solution of hydrochloric acid that has a pH of 3.00. You add 100.0 mL of water to this solution. What is the resulting pH of the solution?
Attractive intermolecular forces exist between the molecules in the gas. The effect of these attractive intermolecular forces in a real gas is to
How many grams of Cu(OH)2 will precipitate when excess KOH solution is added to 63.0 mL of 0.610 M CuSO4 solution.
Then the potential of the mercury cathode was adjusted to -1.80 V vs. SCE, and the quantity of electricity passed during this second electrolysis was 64.17 cou- lombs. Calculate the weight percentages of CCl4 and CHCl3 in the original sample.
Four wavelengths of light are each quantized to excite electrons of a given atom to a particular higher energy shell. Assign wavelengths of 496nm, 356nm, 701nm, and 591nm
We know Pro can interrupt an a-helix, chemically, do you think it will cause any unusual problems in the determination of, angiotension II sequences? Explain.
Peptide hormones must bind to receptors on the extracellular surface of their target cells before their effects are communicated to the interior. In contrast, receptors for hormones such as estrogen are intracellular proteins. Why is this possible..
Using the dumas method, you find that a sample weighing 71.6mg gives 3.84mL of nitrogen gas at 23 deg.celcius and 785 mmHg. What is the volume of nitrogen at STP?
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