Unformatted text preview: How many atoms As atoms per unit cell? Selected Answer: 4 Correct Answer: 4 Question 4 2 of 2 points Describe the chemical bonding in GaAs Selected Answer: covalent/ionic Correct Answer: covalent/ionic Question 5 4 of 4 points If the electronegativity of Ga is X Ga = 1.8 and As is X As = 2.2, calculate the percentage of ionic character of the chemical bond in GaAs. % ionic = (1 e 1/4(Xga Xas)^2 ) x 100 Selected Answer: 4% Correct Answer: 4% Question 6 4 of 4 points Calculate the lattice constant (a) for GaAs in nm (r Ga = 0.126 nm and r As = 0.120 nm). Selected Answer: 0.5681 nm Correct Answer: 0.5681 nm Question 7 4 of 4 points Calculate the density of GaAs (g/cm 3 ) (AW Ga = 69.72 g/mole, AW As = 74.96 g/mole, 6.023 x 10 23 atoms/mole) Selected Answer: 5.241 g/cc Correct Answer: 5.241 g/cc...
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This test prep was uploaded on 04/07/2008 for the course MSE 150 taught by Professor Wittig during the Spring '07 term at Vanderbilt.
 Spring '07
 Wittig

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