The active site of an enzyme is a small portion of the enzyme molecule
What is the function of the rest of the huge molecule?
Check all that apply.
| To pass through cell membranes. |
| To provide sites for enzyme control and regulation. |
| To hold the substrate in place. |
| To stabilize the three-dimensional structure of the enzyme. |
| To align the active-site functional groups that catalyze the reaction. |
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One of the olf columns in your plant failed. You have been putting together jury-rigged system to separate propane fron n-butane. The column you have found is empty, so within reason you can put in as many stages as needed. It is equipped with a partial condenser and a total reboiler. The column is restricted to a maximum pressure of 800,0 kPa, which means that refrigerator is needed. You have a source of refrigerator, but output is limited to 6000.0 kW. Freed is a saturated liquid at 800.0 kPa that is 56.0 mol% propane. Unless stated otherwise distillate should be 99.9 mol% propane, and bottoms should be 1.0 mol% propane or less. You have more feed available that can be processed.
a) generate a y-x graph at 800.0 kPa from the DePriester chart. From the depriester chart find the boiling points of propane at 800.0 kPa (set Kp=1) and n-butane at 800.0 kPa (set K(n-b)=1). The boiling range for the complete y-x diagram lies between these two temperature. Pick a temperature between the two boiling points, find Kp and K(n-b), calculate X(n-b)=(Kp-1)/(Kp-Kb), Xp=1-X(n-b), and Y(n-b)-K(n-b)X(n-b). Doing this for five to ten temperatures generates the y-x graph.
b) if you built a system with a very large number of stages (like N greater than 100) estimate the kmol/h of 99.9mol% distillate that can be produced and kmol/h of feed processed (bottoms less or equal to 1 mol% propane).
c) Repeat part b for 90.0mol% pure propane distillate and 1% or less propane in the bottoms for a saturated liquid feed.
d) if the required purity of the bottoms stream is changed to 10.0 mol% propane, repeat part b (distillate is 99.9% mol% propane).
e) repeat part b for a 99.9 mol% pure propane distillate and 1% or less propane in the bottoms if the feed is a saturated vapor that is 56.0 mol% propane.
f) epeat part b for a 99.9 mol% pure propane distillate and 1% or less propane in the bottoms if the feed is a saturated vapor that is 66.0 mol% propane.
Data: Heat of vaporization of propane at 800 kPa is 18,800 KJ/Kmol, and for butane at 800 kPa is 22,600 KJ/Kmol
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Suppose the feed to a continuous reactor for ammonia synthesis consists of 100 mol/s of nitrogen, 300 mol.s-1 of hydrogen, and 1 mol/s of argon. For a fractional hydrogen conversion of 0.6, calculate the outlet flow rate of hydrogen, the extent of reaction, and the outlet flow rates of nitrogen and ammonia.
N2+3H2=2NH3
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what's the different between the civil engineering and the architecture engineering
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Explain the theory behind a steady state continuous stirred-tank reactor (aka CSTR) and as well an unsteady state CSTR.
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A container contains water at 100 kPa. The specific volume of the water inside the container is 1.00 m3/kg. What is the quality (x) of the water in the container, as a percentage and what is the phase of the water in the container?
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1- Explain the qualitative differences between the Gibbs free energy and the chemical potential.
2- Explain what is wrong with the following statement: If two (or three) phases of a pure material have the same chemical potential, temperature, and pressure, then the equilibrium state of the system will allow a phase transition between the two (or three) phases.
3- Explain qualitatively the differences between Raoult's law and Henry's law, including the composition range in which they are valid.
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I'm writing a report about producing vinyl acetate by reacting ethylene, acetic acid and oxygen to produce vinyl acetate and water.
I want to write about the hazards of the chemical used but not for each one, only the major hazards such as toxicity and flammability, help me
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6. a.) Explain the difference between transmittance, absorbance, and molar absorptivity. Which one is proportional to concentration?
6. b.) What is gained by analyzing a larger number of replicates of a sample? What are the practical limitations on minimizing the standard deviation?
6. c.) What are the necessary properties of the sample holder in spectroscopy? What type of cell can be used in the visible range? What type of sample cell should be used in the ultra-violet region of the spectrum?
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An engineer is designing a total hip implant. She intends to make the femoral stem out of titanium because it forms a good interface with bone. However, since titanium does not have optimum wear properties she intends to make the ball component out of stainless steel and attach it to the stem using a press fit. Should she be worried about corrosion? If so, what types of corrosion could take place?
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A triple-effect evaporator is a process that removes pure water from a salt water feed. The process consists of three units connected in series. The feed to the process contains 3.43 wt % NaCl in water. In the first effect, sufficient water is evaporated to concentrate the solution to 3.89 wt % NaCl. The second effect concentrates the solution further to 4.22 wt %, and the brine discharged from the process contains 5.02 wt % NaCl. a. Draw a diagram of the process, then do a degrees of freedom analysis on each effect and on the entire process to determine which of these choices of system are appropriate starting point(s) for the calculation. b. Determine the total mass of pure water provided by the process per 100 kg of feed. c. Solve for the flow rates of all streams based on 100 kg feed.
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Two circular plates each of radius R are separated by a distance of b. The space between the plates is filled with a fluid. The upper plate moves downward at a constant rate V resulting in fluid being squeezed out between the plates. Determine the mass flow rate and maximum velocity under the following conditions: a) The exit velocity is uniform; b). The exit velocity is parabolic.
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The total capital investment for a conventional chemical plant is $1,500,000 and the plant
produces 3 million kg of product annually. The selling price of the product is $0.82/kg.
Working capital amounts to 15% of the total capital investment. The investment is from
company funds and no interest is charged. Delivered raw materials costs for the product
are $0.09/kg; Labor, $0.08/kg; utilities, $0.05/kg and packaging, $0.008/kg. Distribution
costs are 5% of the total product cost. Estimate a) the manufacturing cost per kg of
product; (b) total product cost per year; (c) Profit per kg of product before taxes and (d)
profit per kg of product after income taxes at 35% of gross profit.
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A gaseous mixture has the following composition: C₂H₄, 57% mol; Ar, 40 mol%; and He, 3% mol. Calculate the volume occupied by 100 mol of this mixture at 120 atm and 25 ° C, using: The ideal gas equation. (Answer: 20.4 L) The generalized compressibility factor and Kay's rule. (Answer: 14.3 L)
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For the the given transfer function G(s) = s2/(s4+7s3+17s2+17s+6)determine
(a) the initial and final values using IVT & FVT,
b) its characteristics (order, pole, zero, order of numerator and denominator, causality, steady state gain), and
(c) the corresponding time domain function
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