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1. Water vapor evaporating from a pond does so as if it were diffusing across an air film 0.15 centimeters thick. The diffusion coefficient of water vapor in 20 degrees C air is about 0.25 cm^2/sec. If the air out of the film is fifty percent saturated with water vapor, how fast will the water level drop in a day? Data: the saturation partial pressure for water vapor at 20 degrees C is 23.4 millibar (1 atm = 1.0325 bar). The molecular weight of water is 18 g/mol. Hint: assume the mixture of air and water vapor obeys the ideal gas law.2. Diaphragm cells are frequently calibrated by allowing 1 molar potassium chloride to diffuse into pure water.Your cell has compartment volumes of (upper) 42.3 cm^3 and (lower) 40.8 cm^3; the diaphragm is a glass frit 2.51 cm in diameter and 0.16 cm thick. In one calibration experiment, the concentration difference at 36 hours 6 minutes is 49.2% of that originally present.Estimate the diffusion coefficient? What is the cell's calibration constant?Assume H, the membrane partition coefficient=1.3. Consider the diffusion of dopant element A into crystalline wafer. The dopant rich coating is considered as a large source of A relevant to the amount of A diffused, so that the surface concentration CAs can be considered a constant. Determine the depth (z) of the front of diffusing dopant after two hours of diffusion. Assume that the front concentration is 2% of the surface concentration. Diffusivity of A= 6.5 X 10^-13 cm^2/s.
What types of behaviors increase trust in interpersonal relationships? What kinds of behaviors decrease trust? Use examples to illustrate your response.
Determine that gas companys' practices may be to blame for calamity. You decide, at that point, to spread word around community about findings so that everyone can unite in fight for justice.
A mixture containing the lipids listed below is separated using a silica gel column and washing with increasingly polar solvents. Rank the lipids in order of elution from the column.
The poverty level standard changes with the size of the family and the cost of living. For 2008, individuals who made just over $_______ and families of four who made just over $_______were eligible for means-tested assistance.
Is Nike’s responsibility to monitor its subcontracted factories a legal, economic, social, or philanthropic responsibility? What was it 10 years ago? What will be in 10 years from now?
What are the issues involved in translation transformative, transactional and transcendent theory into practice.
Enumerate five objectives of a public procurement system Explain the tensions that may exist between these objectives when a procuring entity has to choose a procurement method
Mobilization takes place when people recognize they share a problem with others and that they should act together on the matter. Mobilization isn't a one-time matter.
Typically we base the location of the fossil on where we find it in bedding. The bedding is usually horizontal with the younger material on top and the older material underneath. What if the bedding is no longer horizontal?
The effects of the sympathetic nervous system are essentially opposite of the.
Identify and describe the types of educational materials the moderate-discrepancy hypothesis predicts are most likely to hold children's attention?
What is Watson's 4 card selection task and key research findings relating to it please?
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