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A 50.0 mg sample of an unknown radioactive substance was placed in storage and its mass measured periodically. After 70.6 days, the amount of radioactive substance had decreased to 3.13 mg. What is the half-life of the unknown radioactive substance?
What is the concentration of hydronium ion from pH and the concentration of hydroxide ion from pOH
which solution would show the greatest change in pH upon the addition of 15.0 mL of 1.0 M HCl to 1.0 L of each of the following solutions
this is a question from my chemistry homework. for a im notsure how to get the 10 part. for b i dont really
a 4.0 gram sugar cube is dissolved in a 350 milliliter teacup. what is the molarity of the sugar solution.
the mass loss of the iron nail was 1.511. How many moles of iron were converted to Fe3+?
Recognize the Bronsted-Lowery acid the Bronsted Lowery base the conjugate acid, and conjugate base
In ozone, O3, the two oxygen atoms on the ends of the molecule are equivalent to one another. What is the best choice of hybridization scheme for the atoms of ozone?
The solubility of a slaked lime, Ca(OH)2, in water is .185g/100mL. What volume of .00400 M HCl is needed to neutralize 10.0mL of a saturated Ca(OH)2 solution
We did a lab on equilibrium and le chatelier's principle. On one portion, there was a copper complex, and we had to add different components to a solution and write down the changes that took place
What chemical tests might be used to distinguish between pentanal and 2- pentanone; between benzyl alcohol and diphenylmethanol?
An electron is confined to a one-dimensional box of length L. It falls from the second energy level to the ground state, and releases a photon with a wavelength of 322 nm. What is the length of the box?
A Solution of 1.69g of this compound in 9.23g of benzene freezes at 2.18 degree celsius. What are the molecular formula and molar mass of the compound? ( the normal freezing point of pure benzene is 5.50 degree celsius)
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