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# t1f02 - Home Introduction Policies Resources Requirements...

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Home Introduction Policies Resources Requirements & Grading Syllabus Assignments Handouts Discussion Web Links Distance Learners Contact MSE 200 Test 1 MSE 200

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Use the formulae given at the end. Q1. In sodium chloride, the ionic size of sodium is 0.098 nm and that of chlorine is 0.181 nm. Determine the attractive energy and attractive force between the ions and answer the following questions. Each part carries 2 points. 1. Match the charge associated with the ions a. Sodium .......................... e- (b ) b. chlorine ......................... e+ (a ) 2. The distance of separation in nm between the sodium and chlorine ions is a. 0.544 b. 0.271 c. 0.135 ........ (b ) 3. The attractive interaction energy in Joules between the sodium and chlorine ions is a. -85x 10 -20 b. 85x10 -20 c. 31.37x10 10 (a ) 4.The attractive interactive force in Newtons between the ions is a. 31.37x10 -11 b. -31.37x10 -11 c. 85x10 -20 (a ) Q2. The lattice parameter of copper is 0.362 nanometer. The atomic weight of copper is 63.54. Copper takes up fcc structure. Answer the following questions. 1. The number of atoms per unit cell in copper is a. 1 b.4 c.2 (b ) 2. The shortest distance between atoms in nanometers in copper is a. 0.362 b. 0.256 c. 0.313 (b ) 3. Radius of copper ions in nanometers in the lattice of copper is a. 0.181 b. 0.157 c. 0.128 (c ) 4. Mass of each atom of copper in grams is a. 10.55 b.10.55x10 -23 c. 63.54 ( b) 5. Volume of the unit cell of copper in cubic centimeters is (b ) 6. Density of copper in grams/cubic centimeter is a. 897.9 b. 8.98 c. 0.11 ( b) Q3. At 910 o C, bcc iron changes to fcc iron upon heating. The radius of the iron atom is 0.1258 nm in bcc form and 0.1291 nm in fcc form near 910 o C. Answer the following questions. Each part carries 2 points 1. Atoms in bcc iron touch along a. cube edge b. face diagonal c. body diagonal ( c)
2. Atoms in fcc iron touch along a. cube edge b. face diagonal c. body diagonal (b ) 3. Lattice parameter of bcc iron in nanometers is a. 0.291 b. 0.355 c. 0.252 ( a) 4. Lattice parameter of fcc iron in nanometers is a. 0.298 b. 0.365 c.0.258 ( b) 5. The number of atoms per unit cell of bcc iron is a. 1 b. 2 c. 4 (b ) 6. The number of atoms per unit cell in fcc is a. 1 b. 2 c. 4 (c ) 7. Is the volume occupied by atoms in bcc iron compared that in fcc iron is a. greater b. smaller c. equal ( b) 8. The volume upon heating iron from below 910 o

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