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Explain how doping can increase the conductivity of a semiconductor. What is the difference between an n-type semiconductor and a p-type semiconductor?
Why is the heat of vaporization of water greater at room temperature than it is at its boiling point?
A disk has a moment of inertia 3.0 x 10-4 kg. m2 and rotates with an angular speedof 3.5 rad/sec. What net torque must be applied to bring it to rest within 3 s.
Once equilibrium is reached, what is the final temperature of the metal-water mixture. Neglect heat capacit of the vessel.
When heated, ammonium carbonate decomposes as follows. NH4CO2NH2(s) ->2 NH3(g) + CO2(g) At a certain temperature the equilibrium pressure of the system is 0.318 atm. Calculate KP for the reaction.
After you filter off the component that does not dissolve in dichloromethane, you will transfer the dichloromethane to a separatory funnel and wash with aqueous 1 M sodium hydroxide. Which layer is the dichloromethane layer
Using data from appendix D, calculate [OH-] and pH of a mixture 0.10 M in NaNO2 and 0.20 M in Ca(NO2)2
Write down the Empirical Formula if aA Compound Is 21.20% nitrogen, 6.06% Hydrogen, 24.30% sulfur , And 48.45% Oxygen?
In the study of a second order gas phase reaction, it was found that the molar concentration fell from 200 mmol L-1 to 80 mmol L-1 in 1.20x104 seconds. What is the rate constant of the reaction
A compound of molecular weight 280 g/mol a concentration of 15.0 micrograms per ml absorbs 65 percent of radiation at a certain wavelength in a 2 cm cell.
a solid is known to be insoluble in hexane. a chunk of the solid weighing 12.59g was placed into a graduated cylinder
The freezing point of an aqueous solution containing 15 g of a nonelectrolyte in 150 mL water is -5.4°C. What is the molecular weight of the compound? Kf = 1.86°C/m for water.
In a typical experiment, 0.631 g of COCl2 is injected into a flask of volume 472 cc. When equilibrium is established, it is found that the total pressure is 2.175 atm. Calculate K for the reaction.
How many seconds after the start of the reaction does it take for the reactant concentration to decrease to 0.0185 M?
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