On an atomistic level – why can pond skaters and other small creatures walk on water, whereas we can’t? Similarly, why is it that mosquitos can’t breed in pondwater that has had a small amount of kerosene poured onto it?

Determine the sizing of a desorber for the following conditions: feed alkanolamine liquid flowrate is 4 m3/h, feed gas flowrate is air at 14 kgmol/h. The density of air is 1.188 kg/m3 and density of liquid is 998 kg/m3. The liquid viscosity is 0.998 kg/m/s. The desorption column is to be packed with 35-mm plastics Pall rings. The column should be operated at 50% flooding.

Acetaldehyde, CH3CHO, may be produced by the reaction of ethylene with oxygen in

the presence of a tetrachloropalladate catalyst according to the reaction:

2 CH2CH2+ O2? 2 CH3CHO

In an undesired side reaction some of the ethylene is oxidized to produce carbon

dioxide and water,

CH2CH2+ 3 O2? 2 CO2 + 2 H2O

A catalytic reactor is fed with a mixture of ethylene and oxygen only, and only the two

above reactions occur. The exit stream contains gas with the following composition:

CH2CH2 18.5 mol %

O2 unknown

CH3CHO 47.0 mol %

CO2 6.1 mol %

H2O unknown

Calculate:

a)The composition of the feed mixture.

b)The excess O2(expressed as a percentage).

c) The conversion of ethylene (expressed as a percentage).

d) The yield of acetaldehyde (expressed as a percentage).

e) The selectivity (expressed as a ratio).

A small water pump is used for an irrigation project. The pump takes water in from a river at 10^oC, 100 kPa at a mass flow rate of 16.83 kg/s. The exit line enters a pipe that goes up to an elevation 26.15 mm above the pump and river, where the water runs into an open channel. Assume the process is adiabatic and that the water stays at 10 ^oC. Find the required pump work.

1.    A 1.00 liter solution contains 0.38 M acetic acid and 0.49 M sodium acetate.

If 0.120 moles of calcium hydroxide are added to this system, indicate whether the following statements are true or false.

(Assume that the volume does not change upon the addition of calcium hydroxide.)

A. The number of moles of CH₃COOH will remain the same.

B. The number of moles of CH₃COO^- will decrease.

C. The equilibrium concentration of H₃O⁺ will decrease.

D. The pH will increase.

E. The ratio of [CH₃COOH] / [CH₃COO^-] will decrease.

2.    A 1.00 liter solution contains 0.41 M ammonia and 0.32 M ammonium nitrate.

If 0.16 moles of perchloric acid are added to this system, indicate whether the following statements are true or false.

(Assume that the volume does not change upon the addition of perchloric acid.)

A. The number of moles of NH₃ will remain the same.

B. The number of moles of NH₄⁺ will increase.

C. The equilibrium concentration of H₃O⁺ will remain the same.

D. The pH will decrease.

E. The ratio of [NH₃] / [NH₄⁺] will decrease.

How does the coefficient of friction in diamond compare to the others? Depositing diamond-like coatings on objects is relatively expensive. What might be some application you can think of where there would likely be a cost benefit of depositing diamond film coatings?

Describe active versus passive modification of a package’s internal atmosphere – how do they differ? Give a brief example of each including how and when they are used.

Describe the advantages and disadvantages of MAP. Why do you feel the manufacturer in this article choose to use MAP for this pet food product?

Nitrogen (N2) and Carbon Dioxide (CO2) are two of the main gasses used in MAP. Describe applications for when they are used and include the deteriorative effects they are preventing or slowing down.

As a packaging engineer what packaging functional tests would you perform to assure the package in the article can deliver the desired shelf life? Why is the selection of packaging production equipment important in selecting a production line for MAP?

https://www.packworld.com/machinery/fillingsealing/complete-fresh-pet-food-meals-map-sups

Is there a minimum reflux ratio for the batch distillation? If so, how can we determine it experimentally? Please help me with this. I'm not sure since batch operates like one stage but the slope of the rectifying section is the same? Is it the same way as finding Rmin for Continuous distillation? Thanks!

purpose of creating standard curve for refractive index in smple and fractional distillation experiment?

The Navier Stokes equation is well known. Make the Navier Stokes equation dimensionless. Make your assumptions about the different parameters. Using Reynold's number, show the terms that exist at high Reynold's number and those at low Reynold's number What do these represent?

Please explain in full detail.

what is the difference between Aqueous Environment corrsion and High temperate Environment corrsion?

Q2) what is the difference between cathode and anode?

Please solve them in easy way, clear writing, and show the differences

2. A chemical engineer is monitoring the concentration of chemicals as a function of time in a cylindrical batch reactor of radius R and height H, running at full capacity. The following reaction takes place in the batch reactor: A + 2B ↔ 3C The rates of the forward and reverse reactions follow mass action kinetics; assume rate constants as appropriate.

a) At t=0, the reactor contains zero moles of C and non-zero moles of A and B. If the reactor conditions (e.g. temperature) are always maintained such that the forward reaction is dominant (i.e. safe to assume reverse reaction can be neglected in this case), derive expressions for the concentration of A, B, and C as a function of time for the two cases

i. n_A0 >> n_B0

ii. n_B0 >> n_A0

b) If the reactor conditions allow for the reversible reaction to proceed, write out all the unsteady state materials balances for A, B and C in this batch reactor. (Simplify as much as you can but no need to solve)

2222You have discovered a unique molecule which binds only to anthrax spores and when it does, fluoresces at 650 nm. Please design an inexpensive microchip detector for rapidly screening for the presence of anthrax. Describe details of your feasibility study. Assume lab feasibility of your design is successful; describe your work flow to translate this technology for public use. (Your answers should be clearly described Use schematics diagrams if needed)

Calculate the pH when the following quantities of 0.100 M HNO₃ have been added to 25.00 mL of 0.100 M KOH solution:

1. Initial pH

2. pH at 24.90 mL of HNO₃ added

3. pH at Equivalence point (25.00 mL of HNO₃ added)

4.pH at 25.10 mL of HNO₃ added

5. Final pH (good rule of thumb- 2x volume added to reach equivalence point 50.00 mL of HNO₃ added)

6. Sketch the titration curve for this reaction using the above 5 points

Corals that form in modern oceans precipitate the mineral aragonite as their skeletal material. Is their aragonite skeleton in thermodynamic equilibrium with their surroundings? Explain your answer.