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To produce a device isolation trench you first use CVD to deposit an oxide of 50nm on Si(100). You follow that by a dry thermal oxidation at 1000C for 30 min. At last you fill the rest of the trenches with a CVD Si3N4 layer.
a) Explain what is the final thickness of the dry thermal oxide layer you grew?
b) Define what benefit might the thermal oxide layer provide?
c) Depict the layer structure that results, labeling separately the Si substrate, CVD oxide, thermal oxide, and nitride layers. Use just a simple planar portion of the layer structure.
Demonstrate that if 100 ml of a solution of 5 g of A in water were extracted with two 25 ml portions of ether a smaller amount of A would remain in the water than if the solution were extracted with one 50 ml portion of ether.
You wish to prepare a 0.5 liter solution of an acetate buffer having a pH of 5.0 and a concentration of .1M. The pKa of acetic acid is 4.74. How many moles of acetic acid and sodium acetate would you have to add to prepare this buffer
What is the percent ionization of a 0.186 M solution of this acid? A certain weak base has a Kb of 7.50 × 10-7. What concentration of this base will produce a pH of 10.06?
If all the energy obtained from burning 1.16 pounds of propane is used to heat water, how many kilograms of water can be heated from 24.8 degrees celsius to 43.6 degrees celsius
Gas chromatography. Answer the following questions about retention times of the following compounds. Given naphthalene (boiling point = 218 degrees C), phenol (boiling point =181.7 degrees
since the freezing point of a solution depends on the relative number of particles what would you caclcuate to be the
if the rate law for a reaction is rate ka2ba. what is the overall order of the reaction?b. if the concentration of a
Based on the "like dissolves like" rule, predict whether each of the following solutes is soluble or insoluble in water
A piece of dry ice (solid carbon dioxide) with a mass of 28.5 g is allowed to sublime (convert from solid to gas) into a large balloon. Assuming that all of the carbon dioxide ends up in the balloon, what will be the volume of the balloon at a tem..
Oxygen at 25 degrees C and a pressure of 1000 torr. At STP 1 mol of gas occupies 22.4 L What is the volume in liters of the oxygen gas in the cylinder?
The maximal level of X allowed in the decontaminated waste stream (underflow of stage 5) is 1.20 ppm.
A 3.575g sample of a monoprotic acid was dissolved in water. it took 22.67ml of a .1453 M NaOH solution to neutralize the acid. what is the molar mass of the acid
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