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A theoretical colloidal system has its viscosity dependent on temperature like how the rate constant can be dependent with temperature. The following data were obtained for the viscosity of this colloid as a function of temperature.

T (Celsius): -45, -25, -10, 0, 20, 30

Viscosity (Pa-s): 7010, 263, 35, 12, 1.5, 0.7

Calculate the viscosity of this colloidal system (Pa-s) at 298 K.

choices are;

a) 0.90

b) 0.94

c) 0.96

d) 0.98

e) 1.00

how to write an introduction containing the oxidation of ethylene with oxygen using O2 and methodology ?

Manufacture of Acetylene. For the making of 6000 ft^3 of Acetylene (CHCH) gas at 70F and 750 mmHg. Solid calcium carbide (CaC2) which contains 97 wt% CaC2 and 3 wt% solid inerts is used along with water. The reaction is

The reaction A + 2B  C + D is taking place in a batch reactor. (Cao =1M, Cbo = 3M k=0.001 (1/M^2*min)). a) Assuming an elementary rate law, find the time necessary to reach the conversion of 0.9. You can assume constant volume batch reactor with well mixing. Also form the stoichiometric table. (15 points) b) Sometimes it is hard to obtain numerical solutions to the complex integrals. Find the answer using trapezoidal, Simpson 1/3 and Simpson 3/8, Five-point and n+1 point rules for numerical integration. Compare the results with answer t = 886.3min

Consider a solid spherical medium B with area P and density ρ. The sphere is subjected on both sides to different concentrations C, of species A to which it is permeable. The boundary surfaces at inner radius r1 to outer radius r2 are located within the solid adjacent to the interfaces, and the mole fractions of A at those surfaces are maintained at and respectively at all times. If DAB is the binary diffusivity of A through B, show through the basis that the molar fraction of species A through the sphere at can be expressed as; Ndiff,A, Sphere=4pier1r2CDab(Ya,1-Ya,2/r2-r1) and in terms of the concentration of A at the interfaces as: Ndiff,A,sphere=4pier1r2CDab(Ca,1-Ca,2/r2-r1) (b) Given inner and outer diameter of surfaces of B to be 4.68m and 4.80m respectively; moles per volume of A at the inner surface of B is 0.087 kmol/m3 and the same is negligible at the outer surface. Assuming there is no diffusion in medium B and the total molar concentration is constant, determine the mass flow rate of A by diffusion through medium B.

Calculate the standard enthalpy of reaction of the following:
a. C2H2(g) + O2(g)  2CO(g) + H2O(l)
b. NaOH(s) + HCl(g)  NaCl(s) + H2O(l)
c. H2SO4(l) + 2 NaOH(s)  Na2SO4(s) + H2O(l)

Pure ethanol is contained at the bottom of a long vertical tube( cross sectional area is 0.9 cm²). Above the liquid is a quaescent layer of air.The liquid at the bottom of the tube is carefully adpuruted so that the distance from the air liquid interface to the open top of the tube is constant at 15 cm . No liquid is withdrawn from the tube. At the open end of the tube is perpendicular to the vertical tube so that the concentration of ethanol at the top of the tube is eventially zero. The enture apparatus is kept at 0 degree celcius and P_int= 0.98 atm. The tube is carefully arranged so that there is no convection iin the tube. Over the course of several days we find that the average evaporation rate is 0.9190*10^-3 cm³/. What is the value of the diffusion coefficient of ethanol in air at 0 degree celcius? (mass density is 789 kg*m³ and its molar massis 46.079 g/mol )

A very large piece of carbon steel (? = 7854 kg/m3 , ? = 60.5 W/m·K, ?? = 434 J/kg·K) is initially at a temperature of 40°C. Suddenly, the flat surface of the steel is pressed into contact with an object at a temperature of 20°C. Which of the following is closest to the temperature of the steel at a location 10 mm from the flat surface after 0.5 s?

Which one of the following statements are TRUE or FALSE:

1.1. The bond strength of both reactants and products affect the reaction rate [ 1]

1.2. In most cases where reactions occur in a solution, the more the concentration of reactants decreases, the more the reaction rate increases. [1 ]

1.3. In general, in irreversible gas phase reactions, the total pressure of the mixture affects the reaction rate more than the partial pressures of the reactants. [1 ]

1.4. If the forward reaction is endothermic, the reverse reaction is exothermic. [1 ]

1.5. The reaction rate of endothermic reaction is faster at high temperatures while the rate of exothermic reactions is slower at high temperatures and vice versa [ 1]

1.6. The larger the activation energy, the more sensitive is the rate of reaction to temperature. [1 ]

1.7. The rate of combustion of bigger particles of coal is faster because they contain more energy than smaller particles of coal. [ 1]

1.8. During a catalytic reaction, the catalyst can react but it is not consumed [1 ]

1.9. The reaction rate constant k is not truly constant but it is independent of the concentration of the reactants. [1 ]

1.10. A catalyst lowers the activation energy of reactants so that the reaction rate is relatively high at lower temperatures than the reaction rates without the catalyst.

[1 ]

You are overseeing a process that has a feed of X, Y, and Z entering a Separator. however, the feed has wt% of 30% X and 20% Y. The overhead of the Separator is Pure Z and has a mass flow rate of 18.5 kg/ hr. The bottoms of the Separator only contains X and Y and enters a Scrubber. The overhead of the Scrubber is Pure X and has a mass flow rate of 11 kg/hr. The bottoms of the Scrubber is Pure Y and has a mass flow rate of 8.4 (kg/hr).

a. Draw and completely label this process.

b. Determine all of the balance locations and box them in on the diagram.

c. Find the Feed Flow rate (kg/hr) entering the Separator.

d. If MW of X = 120, MW of Y = 50, and MW of Z = 90; what are the mol% of all the components in the feed?

e. If the limit of the Separator is 20 kg/hr, do we need to shutdown the process? Explain.

f. Is perfect separation feasible? Explain.

1.You are fixing a piece of equipment on a cruiser that requires a zinc fitting. You rest the zinc fitting on a moist copper pipe. You return the next day and find that the zinc is corroded. This type of corrosion is best described as  

a.atmospheric corrosion.

b.chemical corrosion.

c.galvanic corrosion.

d.stress corrosion.

2. Battery acid spills on the deck of a destroyer. Identify the cathodic half-reaction that is expected to take place as part of a corrosion cell.

a. Fe(s) → Fe2+(aq) + 2 e–

b. Fe2+(aq) + 2 e– → Fe(s)

c. Fe2+(aq) + e– → Fe3+(aq)

d. 2 H+(aq) + 2 e– → H2(g)

e. O2(g) → 2 O(g) + 2 e–  

f. O2(g) + 2 H2O(l) + 4 e– → 4 OH–(aq)

Discuss the role of ceramics in biomedical engineering. What are the main advantages and drawbacks of using ceramics (bulk oxides and coatings) as bio-ceramics? Describe bioactive glasses and discuss their limitations along with differences between ordered and disordered glasses

Question 4 : A simplified process for the production of SO3 to be used in the manufacture of sulfuric acid is illustrated in Figure 1. Sulfur is burned with 120% excess air in the burner, but for the reaction S + O2 —> SO2, only 80% conversion of the S to SO2 is achieved in the burner. In the converter, the conversion of SO2 to SO3 is 90% complete. Calculate the kilograms of air required per 100 kg of sulphur burned, and the concentrations of the components in the exit gas from the burner and from the converter in mole fractions. Note 1: MW information (S: 32 g/mol; O2: 32 g/mol; Air: 29 g/mol)