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Gold is a face-centered cubic structure that has a unit cell edge length of 4.08Angstroms . There are four gold atoms per unit cell. How many gold atoms are there in a sphere that is 20nm in diameter? Recall that the volume of a sphere is (4/3) pi r^3
If a buffer solution is 0.230 M in a weak acid (Ka = 3.8 × 10-5) and 0.410 M in its conjugate base, what is the pH
Based on your observations, what might have happened if you had not followed these instructions? Might this also have affected your percent yield? Explain.
Calculate the molar solubility of AgCl in a 1.00L solution containing 10.0g of dissolved CaCl2. Compare the molar solubility of Mg(OH)2 in water and in a solution buffered at a pH of 9.0
What is the ee?, The optical rotation of a compound is -165. What is the ee for a solution mixture with a measured rotation of -50?
if CO2 gas is collected over water at 25 degrees C and 775torr, what is the partial pressure of the CO2? The vapor pressure of water at 25degrees C is 23.8torr.
You are performing site-directed mutagenesis to test predictions about which residues are essential for a protein's function. Which of each pair of amino acid substitutions listed below would you expect to disrupt protein function the most
a 500 gram sample of aluminum pellets specific heat capacity 0.89 jdegrees c x grams 10 gram sample of iron pellets
Write an equation, using the curved-arrow notation, for the acid-base reaction that will take place when each of the following are mixed. If no appreciable acid-base reaction takes place, because the equilibrium is unfavorable, you should so indic..
The effective nuclear charge tends to decrease from left to right across any period of the periodic table. 3.Electrons in the 2s orbital feel a greater attraction to the nucleus than the 2p electrons and are therefore lower in energy. 4. Valence e..
What will happen to the acetate concentration in equilibrium, [HC2H3O2]-> [H^+]+[C2H3O2^-], when sodium acetate is added
The heat of formation of liquid diatomic bromine is 0 kJ/mole. The heat of formation of gaseous diatomic bromine 30.9 kJ/mole. The heat of formation of gaseous monatomic bromine
the anesthetic procaine hydrochloride is often used to deaden pain during dental surgery. the compound is packaged as a 10.% solution (by mass; d= 1.0 g/mL) in water. IF your dentist injects 0.50 mL of the solution, what mass of procaine hydrochlo..
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