Q 1. Definitions: Write a short, but concise definition A. What is the differenc

Question

Q 1. Definitions: Write a short, but concise definition
A. What is the difference between Materials Science and Materials Engineering?
B. What is a Covalent bond?
C. What is an ionic bond?
D. What is a metallic bond?
E. What is a secondary bond?
Q.2. Using the schematic below, answer the following questions:
A. Using the electronic configuration, what is the atomic number?
B. Which element in the periodic this atom represents?
C. What is the crystal structure of this element?
Q 3. Using the schematic for cubic unit cell,
A. Determine the three individual crystallographic (lattice) individual directions (marked in red)?
x
z
y
1
2
3
Prince Mohammad Bin Fahd University - College of Engineering
Mechanical Engineering Department
First midterm Exam MEEN2211
2
Q 4. Using the schematic for cubic unit cell,
A. Determine Miller–Bravais indices for the plane A, B, and C?
Q 5. In ceramic crystal systems;
A. What is the Sodium Chloride crystal structure?
B. What is the coordination number of such system?
C. Compute cation-anion radius ratio for this system?
Q 6. Based on X-Ray Diffraction technique:
A. What is the most probable unit cubic cell for the X-ray diffraction pattern below?
B. If atomic radius of the above crystal system is 0.1241 nm. Calculate the lattice parameter, a, then interplanar spacing d111?

Q2

Q3

Q4

Q6

Explanation / Answer

Solution:

Part 1

A) Material science deals with study, analysis and development of new material bu material engineering studies the appliance of new materials in real life use. eg:- fullrene in nanotechnology

B) A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.

C) Ionic bonding involves in electrostatic attraction of oppositely charged ions namely cation and anion.

D) Metallic bonding occurs from combiantion of mobile electron attraction with fixed electron.

E) Secondary bonds (also known as interparticle, intermolecular, or Van der Waals attractions) are the relatively weaker attractions between nearby atoms or molecules that are important in most liquids (especially liquid mixtures) and some solids.

Part 5

A) NaCl is Face centered (FCC)

B) The coordination is (1 0 0) (1 1 0) (1 1 1)

C) Na:Cl ratio is 1:4 { for 1 Na facing center is surrounded by 4 Cl atoms}

Note: For the rest of the questions figure is needed as it is enclosed along with this questionnaire, kindly requesting to post image separately for providing solution to the rest.

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