a.) Speculate which variable: (a) reaction temperature, (b) conversion of monomer or (c) reaction mixture viscosity, would be the most important for tuning the degree of short chain branching in the high pressure process for making polyethylene using a batch reactor. Explain your reasoning.

b.) why is low density polyethylene (LDPE) low density?

  The stream function in cylindrical coordinates for a two-dimensional flow is given by:

                                    Ψ = [(a)(r) + (b)/(r)] Sin ϴ

Where “a” and “b” are constants.

a)Does this flow satisfy the continuity?

b)Determine the corresponding velocity potential in the polar coordinate system.

c) Is this flow irrotational? Why?

Propanol is burned with excess air to produce a mixture of comstock gases. The burner feed consists of 600 kh / h of propanol and 8700 kg / h of air. It is found that the total conversion of propanol is 90%. 95% of the propanol is burned through the complete reaction and the rest through incomplete reaction.

A. Determine the stoichiometry

CH3CH2CH2OH+ _O2---> _CO2+ H20

CH3CH2CH2OH+_O2 ---> _CO2 +_H20

B. LImitint reagent.

C. Excess reactive and %excess.

D. The molar composition on a humid base of the combustion gases% molar

E. The molar composition of the free gases of water vapor, % molar.

What is the importance of studying the activity coefficients? Specifically of tributyl phosphate dissolved in kerosene

How are specific technologies used differently by different art/design practices? How do these differences demonstrate: (1) in how a practice defines or approaches that technology in the first place and (2) uses it to reveal and present different sorts of ideas and works? Please choose a specific technology (1860 or later) and discuss the history of its appearance and development. Discuss in some detail how (at least) two clearly dissimilar art/design practices have approached, employed, and/or critiqued that same technology. Give examples of specific works and specific writing by 2-3 different artist/designers. What are the ideas and arguments they have at stake? Some suggestions for core technologies: celluloid film, database, magnetic tape, video, white box gallery, incandescent and crepuscular light, software.

What factors are required for the accumulation of hydrocarbons?

What is the most accepted theory as to where oil and gas comes from?

Explain the difference between oxidation/synthesis and endogenous respiration.

A 0.5 cm diameter, 50 cm long horizontal tube is connected to a beaker containing n-butyl alcohol with the orifice located 10 cm below the surface.   Alcohol(70 degrees F) exits from the tube and drops into another container.    Predict the volumetric flow rate for this system. What is the error if the Bernoulli equation is used?

We are separating a mixture that is 10 mol% methanol, 20 mol% ethanol, 30 mol% n-propanol and 40 mol% n-butanol in a distillation column. The feed is a saturated liquid. We desire to recover 98% of the ethanol in the distillate and 97% of the n-propanol in the bottoms product. The column has a total condenser and a partial reboiler and a feed rate of 100 kmol/hour at 1 atm pressure. The external reflux ratio is 5. In the enriching (rectifying) section of the column:

the liquid flow rate > vapor flow rate

the liquid flow rate = vapor flow rate

the liquid flow rate < vapor flow rate

We are studying the corrosion rate between a piece of copper and a piece of zinc by dipping them in water and using a DMM to measure the conductivity. In the first test electric potential was found, then the electrical current was found. My question is how to find corrosion rate? Given the equation Nzinc= I / 2(96485.33), I being the electrical current in amperes. I just want to know really if the information we obtained is enough, maybe could you work it out using theoretical value. potential= 1 volt and current= 0.2 amps?

Please show work,

Thanks

A solution contains 0.041 M Ag and 0.047 M Pb2 . If you add Cl–, AgCl and PbCl2 will begin to precipitate. What is the concentration of Cl– required, in molarity, when A. AgCl precipitation begins? B. AgCl precipitation is 99.99% complete? C. PbCl2 precipitation begins? D. PbCl2 precipitation is 99.99% complete? Finally, give the Cl– concentration range in which Ag can be completely separated from Pb2 by precipitation. E. Give the lowest Cl– concentration for the F. Give the highest Cl–concentration for the separation of Ag from Pb2 : separation of Ag from Pb2 :

The reaction 2A + B → C obeys the rate law –rB = kCB2, where k = 0.25 L/mol.s at 75˚C. A is available as a 1.5 M solution and B as a 1 M solution.

a) A 26 L/s stream of solution A and 30 L/s stream of solution B are combined just before being introduced into a CSTR. If a 150 L reactor is available, how many mole/h of C could be produced?

b) You receive some financing to increase C production. After some investigation, you find you could either add a second 150 L CSTR in series with the first or add another heater to increse the reactor temperature to 85 ˚C. Which is the best option? (The reaction has an activation energy of 70 kJ/mol.)