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(a)Because an exact outer boundary cannot be measured or even calculated for an atom, how are atomic radii determined?
(b) What is the difference between a bonding radius and a nonbonding radius?
(c) For a given element, which one is larger?
(d) If a free atom reacts to become part of a molecule, would you say that the atom gets smaller or larger?
Fluoride (F-) is toxic element (anion) that can be lethal at 0.20 g/70kg of body weight. But because F- at low levels (1ppm) aids in healthy teeth, municipal water sources normally add this level of fluoride.
the dimentionless henerys constant for trichlorothene tce at 23c is 0.4lh2olair. a sealed glass vial is prepared that
you need to make a solution of cano32 for a class demonstration. first you measure a quantity of the solid cano32 by
calculate the volume in L occupied by 0.345moles of a sample of h2(g) at a pressure of 3.90 atm and a temperature of -163C.
What is the molecular weight and structure? Also what does this compounds infrared spectrum and NMR spectrum show?
A solution containing .2g of an unknown substance in 2.5 g of cyclohexane is found to freeze at 5.1 C what is the molar mass of the unknown substance
What is the final temperature inside the vessel after combustion, assuming that the steel vessel has a mass of 12.205kg, the mixture of gases has an average molar heat capacity of 21J/(mol??C), and the heat capacity of steel is 0.499J/(g??C)?
What is the pH of a buffer solution prepared with 0.05 M sodium borate and 0.004 M boric acid. The pKa value of boric acid is 9.21 at 25 degrees Celcius (round to two decimal places).
For fully protonated (99%) benzoic acid in solution write the henderson-hassalbach equation and calculate the pH.
Consider the titration of 80.0 ml of 0.100 M Ba(OH)2 by 0.400 M HCL. Compute the pH of the resulting solution after the following volumes of HCL have been added.
The half-life of 137Ce is 30. years. If we have 150.000 g of 137Ce now, how many grams of Ce will remain in 150. years?
In milk at 37 C, lactobacillus acidophilus has a generation time (doubling time) of about 75 minutes. Calculate the population relative to the initial value at 30,60,90 and 150 minutes
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