4200M1K_F11 - GLY4200C Name 90 points September 21, 2011 18...

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1 GLY4200C Name 90 points September 21, 2011 18 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) 3 T 1. 1.The nucleus of an atom is about 100,000 times smaller than the entire atom. 5 F 2. The size of a sodium metal atom (metallic radius) is smaller than of the sodium cation (ionic radius). 5 T 3. If one orbital contains two electrons, the "s" quantum number for these electrons cannot be the same. 2 F 4. Bohr's model correctly explained the line spectra of all elements known at the time. 0 F 5. Cations are atoms which have lost one or more electrons, and which are negatively charged. 8 T 6. The bonding in water (H 2 O) is more covalent than in sylvite (KCl). (Relevant electronegativities: Hydrogen, 2.1; Oxygen, 3.5: Potassium, 0.9; Chlorine, 2.9) 2 T 7. The dimensions of density are often expressed as g/cm3 in mineralogy, although the SI units are kg/m 3 . 6 F 8. The p subshell has m values of O, +1, or +2. Since l = 1, ml = 0, +1, or -1 1 T 9. The number of protons in the nucleus of an atom determines the type of element. 15 F 10. Ionically bonded substances are molecular, i.e. exhibit properties which may be explained in terms of interactions between molecules. Ionic bonds are non-directional, making the concept of molecule non-functional. 10 T 11. When a piezoelectric crystal is subjected to an electric current the crystal will physically deform. 1 F 12. Perfect cleavage in the British system is better than perfect cleavage in the American system.
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2 6 F 13. Moh’s scale of hardness is a linear scale. See Figure 2.15 on page 30 of text. 3 T 14. Schiller luster is a type of iridescence caused by multiple reflections off of ex- solution lamallae in pyroxene minerals. 7 T 15. Minerals which display parting always break smoothly along a plane with a particular orientation, which varies from mineral to mineral. Parting is do to defects, which are not always present. 4 T 16. Atoms are electrically neutral, having an equal number of protons and electrons. 5 F 17, Small ions are easier to polarize than large ions. Small ions have few electrons, tightly held in inner orbitals 1 T 18. In the pyroelectric effect, the degree of polarization is proportional to the magnitude of the temperature change. 8 T 19. If the bonding mechanism is not dominantly ionic, radius ratio considerations may not be adequately used to determine the coordination number. See text, page 73 5 T 20. In minerals with more than one bond type, it is common for the mineral to have strongly directional properties. See text, page 64 1 F 21. At room temperatures, ionically bonded substances are good conductors of electricity.
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This note was uploaded on 12/12/2011 for the course GLY 4200c taught by Professor Warburton during the Fall '10 term at FAU.

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4200M1K_F11 - GLY4200C Name 90 points September 21, 2011 18...

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