Chemical similarity to calcium
Because of its chemical similarity to calcium, 90/38 Sr can collect in the bones and present a health risk. What percentage of 90/38 Sr present initially still exists after a period of 60 years?
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Can you predict the strength of an acid or base, (assuming you know it's an acid or base before hand), based on the number of Oxygen atoms or Hydrogen atoms in the substance?
Determine the atomic number and valence orbital that is filling for the element that would appear below thallium in the periodic table.
An open rectangular tanks is 3m wide and 4m long. The tank contains water to depth of 2m and oil (SG=0.8) on top of the water to a depth of 1m.
How many times larger is the spacing between the energy levels with n=3 and n=4 than the spacing between the energy levels n=8 and n=9 for the one electron beryllium species?
A couple plans to have three children. assuming that each child is equally likely to be a boy or girl, find the probability distribution of the number of girls among the three children. Then find the mean and standard deviation of the number of gir
Determine the blood volume of a Rabbit from the following data. A 2.8 ml volume of radioactive plasma with a activity of 5.60 x 10 4 dpm is injected into the blood steam. Later a 1.4 ml sample of blood plasma is removed and has an activity of 798
A mixture of aluminum and zinc has a mass 2.30g. Excess HCl is added to the mixture and 2.30L of H2 (hydrogen gas) was produced at a pressure of 1.10 atmospheres and a temperature of 25 degrees Celsius.
What is the velocity of the object in meters per second just before striking the ground? How much work is done on the object?
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