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4200M1K_F10 - GLY4200C Name 90 points 17 took exam Numbers...

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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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