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Consider Si uniformly doped with 1015 cm23 boron atoms.
(a) What are the carrier concentrations at 27°C?
(b) What are the carrier concentrations at 100°C?
(c) If 1 1016/cm3 2 phosphorous atoms are added, what are the approximate equilibrium electron and hole concentrations at 27°C?
Explain why a buffer made of equal concentrations of CH3COOH and CH3COO- does not change in pH when a small amount of NaOH (a strong base) is added to the solution. Does the NaOH dissociate into ions when it is added to the solution?
The concentration of Lead ions (Pb 2+) in a sample of polluted water is determined by adding solid sodium sulfate (Na2SO4) to the sample. The net ionic equation of the reaction is
Calculate the wavelength in picometer of gamma ray radiation whose frequency is 9.74 × 1019 Hz. Express answer in scientific notation.
Give the formula of a compound that includes an ester group, an acyl bromide group and an aldehyde group and that shows optical isomerism. The functional groups should be shown in full and not in abbreviated form.
Write out all the steps in the mechanism for ammonolysis of butyl benzoate and Ethers and alcohols can be isomeric. Write the structures, and give names for all possible isomers with the molecular formula C4H10O.
Determine the theatrical yield if 1.56 grams of hydrogen is permitted to combines with 9.70 grams of nitrogen producing 1.43 grams of ammonia?
If you add a solvent called "dioxane" to water, a homogenous mixture forms. Dioxane and water have the same boiling point (100oC). How do you explain that the mixture of the two compounds shows a boiling point that is lower than the one found for ..
Instructions for antacid tablets may direct the user to take 2-3 tablets for reduction of stomach acid. Assuming that a particular individual's stomach contains 1 quart of 0.1 M HCl, and that an antacid tablet contains as its active ingredient 500..
Suppose the calorimeter for this experiment had been made of a heat-conducting material (such as metal) rather than plastic foam, so that the portion of heat energy lost to the calorimeter itself was larger and could not be ignored
if the ethyl alcohol at 35 degree rise through 8.36 cm in a capillary tube of radius 0.20 mm , What is surface tension
The reactant concentration in a second-order reaction was 0.410 M after 190s and 1.60×10^?2 M after 820s . What is the rate constant for this reaction
Seawater contains approximately 3.5% NaCl by mass and has a density of 1.02g/ml. What volume of seawater contains 6.5g of sodium
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