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A silicon wafer is etched in a Cl2 plasma. A mass flow controller (used to meter the gas flow fed to the reactor) shows a reading of 100 sccm (sccm=standard cm3 per min; standard conditions are 273 K and 1 atm). The etching reactor operates at 100 mTorr pressure, and the reactor gas temperature is 500 K. (note: 1 atm =760 Torr.)
(a) What is the chlorine flow rate at the reactor pressure and temperature?
(b) If the etching rate of silicon is 0.50 ?/min, and the wafer is 300 mm in diameter, how many moles of silicon are etched per hour?
What chemical tests might be used to ditinguish between pentanal and 2-pentanone; between benzyl alcohol and diphenylmethanol?
Calculate the standard free energy change for silver sulfate dissolution at 25 degrees Celsius.
Write the equations for the ionization of 3-aminophenol. Would this substance be more soluble in water at pH 2.0 or pH 8.0? Would you expect this substance to be absorbed into the bloodstream in the stomach or the intestines?
A graduated cylinder contains 145mL of water. A 10.0g piece of iron (density = 7.86g/cm3 ) and a 22.0g piece of lead are added.
Using a reasonable range of temperatures, determine the apparent (or global) activation energy of NO formation during a combustion process
Which of the following statements is true? a. The critical temperature must be reached to change liquid to gas. b. To melt a solid at constant pressure, the temperature must be above the triple point.
Nitrogen and oxygen do not react appreciably at room temperature, as illustrated by our atmosphere. But at high temperatures, the reaction below can proceed to a measurable extent.
Write a mechanism for the reaction. Include arrows to show electron flow. Number and write out each step individually.
Consider the reaction 2NO2(g)--> N2O4(g). Go = -5.40 kJ at 298K. (b) Calculate delta G at 298K if partialpressures of NO2 and N2O4 are 0.36 atm and 1.60 atm
what is the density of a block of marble that occupies 285 centimeters cubed and has a mass of 636 grams? answer in units of g/centimeters cubed.
Rank the following aqueous solutions in order of increasing boiling point: 0.10 mNa2SO4, 0.10 m SrSO4, 0.25 m sucrose, 0.20 m glucose, 0.15 m NaCl
And, of course, ammonia is a base so there will be some NH4+ in solution also. Assume that the concentration of unprotonated NH3 is 0.040 M. What fraction of the cadmium ions are in the form of Cd2+
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