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Exam 1 Answers - MSE 200-002 Midterm Exam #1 Spring 2007...

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MSE 200-002 Midterm Exam #1 Spring 2007 ID No: Instructor: Alexei Gruverman No notes, books, or information stored in calculator memories may be used. Cheating will be punished severely. Constants, equations, and other data are given on the last page of the exam. Multiple choice (2 points each): ___b_1. Very electropositive atoms, like Na, are most likely to____ when bonding to a very electronegative atom: a. attract an extra electron b. give up a valence electron c. form metallic bonds d. none of the above _b___2. Each element is characterized by a unique atomic number (Z), which indicates a. the number of protons plus neutrons in the nucleus b. the number of protons in the nucleus c. the number of neutrons in the nucleus d. the atomic weight of the element _a___3. The electron configuration of fluorine (1s 2 2s 2 2p 5 ) indicates that it a. is very electronegative b. is very electropositive c. is a noble gas d. has one valence electron. _d___4. Potassium (K) has an atomic number Z = 19. The electronic configuration for a potassium ion with a plus one (+1) charge is: a. 1s 2 2s 2 2p 6 3s 2 3p 4 b. 1s 2 2s 2 2p 6 3s 2 3p 1 4s 1 c. 1s 2 2s 2 2p 6 3s 2 3p 5 3d 1 d. 1s 2 2s 2 2p 6 3s 2 3p 6 1
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__ a___ 5. Chlorine (Z=17) is more likely to form an ionic bond with a. calcium (Z=20) b. oxygen (Z=8) c. fluorine (Z=9) d. Ar (Z=18) _b___6. Simple metals having the BCC structure a. have an atomic packing factor (APF) equal to 0.52 b. have the APF that is smaller than the APF for the HCP structure c. have the APF that is larger than the APF for the HCP structure d. have the APF that is equal to the APF for the FCC structure __c__7. In the cubic system, planes in a family of crystallographic planes a. are always close-packed b. are always parallel c. are equivalent d. all of the above a 8. Bonding via 'sharing of electrons' between two adjacent atoms describes: a. covalent bonding b. ionic bonding c. Van der-Waals bonding d. all of the above _c___9. What characterizes the group of inert (noble) gases? a. atoms with no electrons on the outer shell b. atoms that give electrons away c. atoms with the maximum number of electrons on the outer shell d. none of the above 2
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__c_ 10. How many atoms are there in 1 g of silver (atomic weight 107.87 g/mol)? a. 1.79 x 10 -20 atoms b. 6.49 x 10 25 atoms c. 5.58 x 10 21 atoms d. 6.53 x 10 21 atoms __a___11. What is the mass (in grams) of one atom of gold (atomic weight 196.97 g/mol)? a. 3.27 x 10 -22 g b. 2.14 x 10 -25 g c. 3.48 x 10 -21 g d. 6.02 x 10 -23 g __ b___ 12. Calculate the number of atoms in 1 cm 3 of copper assuming no vacancies (atomic weight of 63.55 g/mole, density of 8.94 g/cm 3 ). a. 4.28 x 10
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This test prep was uploaded on 04/02/2008 for the course MSE 200 taught by Professor Wholedepartment during the Spring '08 term at N.C. State.

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Exam 1 Answers - MSE 200-002 Midterm Exam #1 Spring 2007...

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