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Practice Exam

# Practice Exam - EGN 3365 Practice Exam Problems Feb 2008...

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EGN 3365 Practice Exam Problems Feb, 2008 Problem 1 Calculate the ionic diameter of titanium, i.e. radius of sphere, that would fit inside the barium titanate (BaTiO 3 ) unit cell if the barium ion (radius = 0.136 nm) and oxygen ion (radius = 0.14nm) touched across the <110> directions. (a) Ionic Radius of Ti x = nm (b) What would be the valence (charge) of Titanium ion ? Valence = Problem 2 Draw and label the followings. Clearly identify the origin within each unit cell. 1 2 1 [ ] , 1 10 ( ) , 22 1 ( ) , 1 2 1 ( ) Problem 3 (a) A metal with an atomic weight of 95.94 g/mole and an atomic radius of 0.1363 nm has a density of 10.21 g/cm 3 . Determined whether its crystal structure is simple cubic, body- centered cubic or face-centered cubic. (b) Determine the first four x-ray diffraction peaks for this metal by filling the table below. Note that λ = 0.1542 nm. Plane (h k l) 2 θ (degrees) Interplanar Distance, d (hkl) , (nm)

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Problem 4 In a Na + -Cl - ion pair, the net potential energy E N
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Practice Exam - EGN 3365 Practice Exam Problems Feb 2008...

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