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an p-type silicon substrate with the doping density of 10^15 cm^-3 Boron is to be converted into N-type by Phosphorous dopant, so that the resistivity at T = 100 C is 1.2 ohm-cm. all atom are fully ionized. calculate the doping density of Phosphorous and the resistivity of the sample at room temperature
Calculate expected final temperature for 25 grams of 70 C hot water melting 15 grams of 0 C ice. Repeat this calculation
Draw a reaction coordinate diagram for each of the following nucleophilic addition-elimination reactions. a. the nucleophile being a weaker base than the leaving group
Twenty grams of a solute are added to 100g of water at 25C. the vapor pressure of pure water is 23.76 mmHg, the vapor pressure of the solution is 22.41 torr.
How much heat is required to raise the temperature of a 464g of lead from -20.0C to 219C
For each of the following species, draw its Lewis-dot structure. If the species exhibits resonance, draw all the resonance hybrids. For each species, tell its shape, bond angles, hybridization of the central atom, and whether it is polar or nonpola..
If equal volumes of 0.15 NaOH and 0.10 NaH2PO4 are mixed what type of system is formed? A) Buffer Ka2 B) amphiprotic C) Buffer Ka3 D) strong base
This is for two dimensional arrays with both positive and negations ions alternating in a square pattern. I am given the hint to select an area with boundries through the middle of the outermost ions-ie the edge ions count as 1/2
477 J amount Energy is added to a 74.0 grams sample of H 2 O at a temperature of 21 degree Celsius. Determine what will be the final temperature of the H 2 O?
What is the pH of 10 drops of triethylamine in a dropperful of demineralized water? How does the reaction between triethylamine and water explain the measurement of the pH?
How much heat is required in kJ to melt 60.7 g of manganese at its melting point? The heat of fusion of manganese is 12.9 kJ/mol
What mass of carbon monoxide in grams is present in a room measuring 8.5 12.0 18.4 ft ?
What volume of 0.1000 M NaOH is required to titrate a 0.1000 M propionic acid solution, CH3CH2COOH, Ka = 1.3 x 10-5 , to the equivalence point?
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