Question 9In terms of its atomic structure, quartz can be described as silicon-oxygentetrahedral molecules arranged as:Select one:a.a 3D crystalline structureO b. a flat sheet structure.O c.an amorphous network structure.d.long chain molecules.Question 10In galvanic corrosion,Select one:a. The combination of a large anode and small cathode is the potentialdangerous and should be avoided.b. The further apart of the metals in the galvanic series, the greater is theseverity of the corrosion attackO c. Installation of third metal that is anodic to two metals in a systemworsens the galvanic corrosion.d.The rate of attack increases markedly at greater distances from theinterface of the two metals.

we are to discuss on the nature of quartz

Answered: In terms of its atomic structure,…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question 3: : Estimate the corrosion rate (g/cm².s), penetration rate (mm/yr), and Ecorr (V) for a zinc tank containing oxygen free solution (pH =0). Assume the anodic reaction is under activation control and cathodic reactions is under activation and concentration control with the limiting current density for hy- drogen reduction on Zn is 5×10-5 A/cm?. [Zn**] = 1M at 298 K. The atomic weight of zinc is 65.4 g/mol. Density of zinc is 7.13 g/cm³. io, Zn = 1×10-7 A/cm², ßa= 0.09 V/decade io, H= 1×10-10 A/cm?, Bc= -0.08 V/decade icorr = 1.2×10-4 A/cm2
Question 2 Estimate the corrosion rate (g/cm².s), penetration rate (mm/yr), and Ecorr (V) for a zinc tank containing oxygen free solution (pH =0). Assume both anodic and cathodic reactions are under activation control. [Zn] = IM at 298 K. The atomic weight of zinc is 65.4 g/mol. Density of zinc is 7.13 g/em'. io, Zn = 1x10" A/cm², ßa = 0.09 V/decade io, H=1×1010 A/cm², ße= -0.08 V/decade 0.4 -0.6 Zn Ze 2e Zn? Zn -0.8 10-1 10-1 104 10 104 104 CURRENT DENSITY (A/cm?) POTENTIAL. E
Discussion: 1- Define the corrosion and mention its types? 2- What is the effect of solution aeration on corrosion rate? 3- Compare corrosion rate for a metallic sample immersed in acidic solution with that immersed in a salt solution. 4- What is the effect of the exposure period on the corrosion rate? 5- Discuss the relationship between weight loss and time.
In preventing corrosion of iron, a stronger reducing agent called sacrificial anode such as zinc is used to coat iron. Select one: True False
Consider two types of thermal barrier coatings made of Zirconia. The first A is pure Zirconia and the second B has a small % of yttrium added to it. Upon cooling a coating of either type from high temperature to room temperature, what of the following is the most likely outcome? Select one: b. A: stays stable; B: experiences high stress, phase transformation and undergoes cracking; A: stays stable; B: stays stable O c. A: experiences high stress, phase transformation and undergoes cracking; B: undergoes cracking and distortion d. A: experiences high stress, phase transformation and undergoes cracking; B: stays stable
name two types of point defects and distinguish between them. List three methods of precenting corrosion, and describe ONE in detail. 10. An application requires a part to have high tensile strength (in tension) while at the same time having low density. Suggest a material which would satisfy these requirements at a relatively low cost, and justify your choice.
Most ceramics materials are immune (resist) to corrosion because: they are chemically stable and insulators they have free electrons they have low density they have low bonding energy
Consider two types of thermal barrier coatings made of Zirconia. The first A is pure Zirconia and the second B has a small % of yttrium added to it. Upon cooling a coating of either type from high temperature to room temperature, what of the following is the most likely outcome? Select one: a. A: stays stable; B: stays stable b. A: stays stable; B: experiences high stress, phase transformation and undergoes cracking; c. A: experiences high stress, phase transformation and undergoes cracking; B: stays stable d. A: experiences high stress, phase transformation and undergoes cracking; B: undergoes cracking and distortion
Calculate the maximum membrane stress in the wall of shells having the following shapes. The vessel walls are 2.5 mm thick and subject to an internal pressure of 5 bar. Give a corrosion allowance of 1 mm. a) An ellipsoid, major axis 2.1 m, minor axis 1.8 m; b) A cylindrical shell.
Explain about the Erossion Corrosion in terms of :- -Factors influence -Mechanism -Affects(Surface of films, Effect of pH, Velocity Effects). -Preventions -Prone areas Summarized all the information by using MIND MAP.
In galvanic corrosion, Select one: a. The combination of a large anode and small cathode is the potential dangerous and should be avoided. Ob. The further apart of the metals in the galvanic series, the greater is the severity of the corrosion attack O c. Installation of third metal that is anodic to two metals in a system worsens the galvanic corrosion. d. The rate of attack increases markedly at greater distances from the interface of the two metals.
When answering the following questions, ensure that you explain in terms of both the microscopic and macroscopic structure of the materials. A) Metallic- explain the differences in terms of structure for both low carbon and high carbon steels, also explaining how the structure and carbon content impacts properties of the steel. B) Ceramic - state the structure of a PZT based piezoelectric ceramic material , explain how this can be made piezoelectric and the key properties and changes that can occur.

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In terms of its atomic structure, quartz can be described as silicon-oxygen tetrahedral molecules arranged as: