Draw a rough energy band
In what type of material is the energy gap between the valence and the conduction band the greatest? Na, Ge or diamond. Draw a rough energy band showing the valence and conduction bands in these materials.
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How many grams of dry NH4Cl need to be added to 2.50 L of a 0.500 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.74? Kb for ammonia is 1.8*10^-5.
Compute the momentum of a water molecule at normal conditions, assuming its kinetic energy (mv2 /2) is equal to (3kB T/2).
Suppose you inserted a piece of an unknown metal into a solution of zinc (II) nitrate and observed no reaction. Then if you inserted the unknown piece of the metal into the solution of iron (III) chloride a deposit formed on the bottom of the well
If 8.0 moles of the gas A is placed in a 60.0 L tank with 1.0 moles of B at 0 degrees celsius and 1 atm, they react according to the equation: 2A(g) + B(g) ---> 3C(g) + D(g) How many moles are present in the tank when the reaction is complete
A mixture of 80.0mL of hydrogen and 60.0mL of oxygen is ignited by a spark to form water. a) Does any gas remain un-reacted. Which one. b) What volume of which gas (if any) remains un-reacted
The condensate from a steam distillation contains 10g of compound A and 18g of Water. At the temperature of the distillation, the vapor pressure of Water is 660 Torr. What is the approximate Molecular Weight of A
A certain indicator, HA, has a Ka value of 0.00050. The protonated form of the indicator is red and the ionized form is blue. What is the pKa of the indicator
What is the density of the atom in grams per cubic centimeter? Assume the nucleus is a sphere with volume =(4/3)pi r^3.
The sample of 19.2g of KCl is dissolved into a solution with a total volume of 242.0 mL. what is the molarity of the solution
A sample of 0.836 gm of unknown compound containing barium ions ( Ba2+) is dissolved in water and treated with an excess of Na2SO4. If the mass of BaSo4 precipitate formed 0.7403 gm, What is the percent by mass of Ba in the original unknown compou
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