Lecture Test/HW keys

Lecture Test/HW keys - GLY4200C Name 108 points December 6...

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1 GLY4200C Name 108 points December 6, 2010 15 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 -- FINAL 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) 1 T 1. All chemical systems tend naturally toward states of minimum Gibbs free energy. 2 T 2. Intensive properties, such as temperature or density, do not depend on the amount of material present 2 F 3. Phase diagrams show the stable phase at any point in the diagram, and the stable phase always has the maximum value of G. 0 T 4. In a binary T-X diagram, pressure is assumed to be fixed. 5 F 5. Points plotted on the edge of a ternary diagram have three components. 9 F 6. The transition from " -quartz to $ -quartz, and vice-versa, involves movement of ions, but no bond breakage, and is therefore very slow. 2 T 7. Solvus lines separate regions of a single solid phase from regions of two solid phases 0 T 8. A stoichiometric relationship between substances reduces the number of components necessary to fully describe the system. 1 F 9. Binary diagrams have three components. 0 F 10. Incongruent melting means melting of a substance directly to a liquid that is of the same composition as the solid. 1 T 11. If the two identical waves are exactly out of phase, the resultant has zero amplitude, and the result will be total destruction. 6 F 12. The index of refraction is independent of the frequency of light used to measure it.
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2 3 F 13. Anisotropic crystals will show their most intense, or brightest, interference colors at the extinction position. 1 T 14. All isotropic substances have a spherical optical indicatrix. 5 T 15. A section through a uniaxial indicatrix perpendicular to the z axis will be circular, with a radius equal to omega. 3 T 16. The optic axial plane has two directions where the index of refraction is equal to $ 2 T 17. $ is normal to the OAP plane. 10 F 18. If X is the acute bisectrix, B x a , then 2V z < 90 degrees. (If 2V x is acute, then 2V z is obtuse) 5 F 19. The indicatrix for a biaxial crystal has two axes. 3 F 20. The direction of ray propagation and the wave normal are always parallel. 0 T 21. Immersion oils with values greater than 1.80 often contain poly-chlorinated biphenyls, and must be used with great caution, since these compounds are known to be powerful carcinogens. 10 F 22. In optical mineralogy, most of the work done is done in conoscopic mode. Only interference figures are routinely done using conoscopic mode. 9 F 23. A crystal viewed in crossed nicols shows a white interference color. When the polarizer is rotated to produce parallel nicols, the observed color remains white. Thus the original color was 1° white. 3
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Lecture Test/HW keys - GLY4200C Name 108 points December 6...

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