4200M1K_F10

4200M1K_F10 - GLY4200C Name 90 points September 21, 2010 17...

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1 GLY4200C Name 90 points September 21, 2010 17 took exam - Numbers to the left of the question number in red are the number of incorrect responses. Instructor comments are in blue . Florida Atlantic University MINERALOGY -- MIDTERM 1 EXAMINATION KEY True-False - Print the letter T or F in the blank to indicate if each of the following statements is true or false. Illegible answers are wrong. (1 point each) 4 T 1. In any stable chemical bond, energy is released as the two atoms or ions combine. 3 F 2. Anions are atoms which have gained one or more electrons, and which are positively charged. 9 F 3. A clear, colorless piece of calcite is said to have a transparent luster. Luster refers to reflected light, not transmitted. 2 F 4. At room temperatures, ionically bonded substances are good conductors of electricity. 1 T 5. Shortwave ultraviolet radiation is dangerous to eye tissue. 3 T 6. Ionic bonds are formed between widely separated (in the periodic table) elements. 1 T 7. Iridescence is caused by interference of light in thin films of different refractive indices and varying thickness. 1 T 8. Quantum mechanically allowed states require that the number of wavelengths of the electron per orbit be integral. 1 F 9. Specific gravity has the dimensions of g/cm3 in mineralogy. 0 T 10. A curving fracture typical of broken glass is said to be conchoidal. 4 F 11. The size of a lithium metal atom (metallic radius) is smaller than of the lithium cation (ionic radius). 6 F 12. A layered structure with a repeat pattern of ABCABCABC. ..is known as hexagonal closest packing. This is cubic closest packing
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2 8 T 13. The lanthanide contraction is the result of increasing nuclear charge across the rare earth series, while the outer electronic configuration remains the same. The 4f electrons are inside the valance electrons, thus the outside remains the same 4 T 14. In cubic coordination, the coordination number is 8. 1 F 15. Van der Waals bonding is stronger than hydrogen bonding, in minerals where both types of bond are present. 7 F 16. The bonding in Rb 2 O is more covalent than the bonding in CCl 4 . (Relevant electronegativities: Rb, 0.8; O, 3.5; C, 2.5; and Cl, 3.0). The greater the difference in electronegativities, the more ionic the bond. Multiple-Choice - Choose the best response to each statement or question. Print the letter corresponding to your choice in the blank. (1 point each) 2 A 1. The bonding in diamond is of what type? A. Covalent B. Ionic C. Van der Waals D. Hydrogen 7 A 2. Most of the volume of an atom is filled by: The nucleus has a radius about 10 -5 times the radius of the atom. A. Electrons B. Neutrons C. Protons D. The nucleus 2 B 3. Minerals like the micas, which can be bent without breaking, but which return to their original shape after bending, are: A. Adamantine B. Elastic C. Flexible D. Malleable 0 A 4. The hard, brilliant luster characteristic of diamond is: A. Adamantine B. Pearly C. Resinous D. Vitreous
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3 1 B 5. Words like brittle, ductile, elastic, and malleable are used to describe which mineral property?
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This note was uploaded on 12/13/2010 for the course GLY 4200c taught by Professor Warburton during the Spring '10 term at FAU.

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4200M1K_F10 - GLY4200C Name 90 points September 21, 2010 17...

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