Study questions for MSE230 Midterm I 1 Compute the percentage ionic character and percentage covalent character of the interatomic bonds for each of the following compounds MgO GaP CsF CdS and FeO From Callister Chapter 2 What is the primary bonding type 2 Specify the primary type of bonding for the given elements Na C Ar Ge Ni and polyethylene 3 The boiling temperatures for some elements and molecules are plotted below How would you explain a the increasing trend for Ne Ar Kr Xe in terms of bonding b the increasing trend for CH4 SiH4 GeH4 SnH4 in terms of bonding c the anomaly of water H2O Hint Think of the factors that affect the van der Waals type of bonding 4 How are individual directions planes and families of directions planes denoted Fill in the table xxx xxx xxx xxx Individual Family Direction Plane 5 a What is the family of planes for 111 b What is the family of direction for 110 c Which directions in the 110 family are located on 1 1 1 plane 6 Below is the geometry for the 110 for BCC a Express the length of the edges in terms of the lattice parameter a and equilibrium atomic radius r b Draw the positions of the atoms and indicate where the atoms touch c Draw the 0 0 1 1 1 0 and 1 1 1 7 Below is the 111 for FCC a Express the lengths of the edges in terms of the lattice parameter a and atomic radius r b Draw the positions of the atoms in the plane and where they touch c Draw 1 0 1 1 1 0 0 1 1 on the plane 8 For a cubic crystal put the given dhkl values d200 d101 d220 d311 d110 d100 d111 in order from largest to smallest 9 Figure below shows the first five peaks of the x ray diffraction pattern for tungsten which has a BCC crystal structure monochromatic x radiation having a wavelength of 0 1542 nm was used a Index i e give h k and l indices for each of these peaks b Determine the interplanar spacing for each of the peaks c For each peak determine the atomic radius for W From Callister Chapter 3 10 Identify the microstructural imperfections at A B and C 11 A metal specimen 300 mm long and having an elastic modulus of 200 GPa is deformed under a stress of 400 MPa with the resulting strain of 0 005 Calculate the final length of the specimen when the stress is released 12 Consider a cylindrical specimen of some hypothetical metal alloy that has a diameter of 10 0 4 mm A tensile force of 1500 N produces an elastic reduction in diameter of 6 7x10 mm Compute the elastic modulus of this alloy given that Poisson s ratio is 0 35 From Callister Chapter 6 13 Identify all distinct possible slip systems for a 111 110 b 111 121 14 A single crystal of a metal that has the BCC crystal structure is oriented such that a tensile stress is applied in the 100 direction Which slip system will not operate From Callister Chapter 7
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