<p>Review questions for unit 3 test, scantron: You may use only your periodic table during both the scantron and the open ended parts of this test!</p><p>The 15 actual m. choice questions are similar to the questions listed here, and all multiple choice. Molecules are NOT identical to the ones used below; but, they are similar!</p><p>1. T/F: Nonmetal atoms combine by sharing electrons because anions attract each other?</p><p>2. T/F: Nonmetal atoms combine by sharing electrons because atoms are more stable with an octet of electrons.</p><p>3. T/F: The Cl2 molecule has all single bonds.</p><p>4. T/F: The CO molecule has all single bonds.</p><p>5. T/F: The O2 molecule has all single bonds.</p><p>6. T/F: The O2 molecule has 1 double bond.</p><p>7. T/F: The N2 molecule has all single bonds.</p><p>8. T/F: The N2 molecule has 1 triple bond.</p><p>9. T/F: The CO molecule has 1 triple bond.</p><p>10. T/F: The central atom in the molecule, CO2, does not follow the octet rule.</p><p>11. T/F: The central atom in the molecule, H2S, does not follow the octet rule.</p><p>12. T/F: The central atom in the molecule, PCl3, does not follow the octet rule.</p><p>13. T/F: The central atom in the molecule, SF6, does not follow the octet rule.</p><p>14. Accordint to VSEPR theory, molecules adjust their shapes to keep _____ as far apart as possible. A. protons. B. neutrons and protons C. valence electron pairs D. cations and anions</p><p>15. The shape of CO is called: A. linear B. bent C. trigonal planar D. pyramidal E. tetrahedral</p><p>16. The shape of CF4 is called: A. linear B. bent C. trigonal planar D. pyramidal E. tetrahedral</p><p>17. T/F: In a “resonance structure”, the measured bond length and strength are somewhere midway between what is expected.</p><p>18. T/F: In a “resonance structure”, the molecule is unusually stable.</p><p>19. T/F: More than one dot structure may be drawn for a resonance structure.</p><p>20. By which atom(s) should you draw the partial negative symbol in the molecule, H2O?</p><p>A. H B. O C. both H and O D. Neither H nor O</p><p>21. Which is the least electronegative atom of the atoms listed: A = H B = I C = O D = S</p><p>22. When a water molecule is placed between 2 charged plates, the molecules rotate so that: A. the positive part of the water molecule faces the positive plate</p><p>B. the nucleus of the water atoms face the positive plate</p><p>C. the negative part of the water molecule faces the positive plate</p><p>D. water molecule’s don’t rotate in response to an electric field</p><p>23. One of which 3 atoms must be covalent bonded to an H in order for Hydrogen Bonding to occur? a. O, S, F b. F, O, N c. F, C, Cl d. N, O, S</p><p>24. Binary molecules are made up of:</p><p>A. 2 nonmetal elements B. 2 metal elements C. 1 nonmetal and 1 metal D. 1 nonmetal and 1 metalloid.</p><p>25. T/F: A molecule with a “coordinate covalent bond” is one in which extra electrons should be added or taken away from the dot structure.</p><p>26. T/F: A “coordinate covalent bond” is a bond in which one of the 2 atoms in the bond has contributed more than half of the shared electrons in that bond.</p><p>27. Which of the following choices contains some of the elements which are naturally found in the form of a diatomic molecule?</p><p>A. H B. H, C, O, S C. H, C, N, O D. H and the halogens</p><p>28. Which of the following compounds contain 2 double covalent bonds?</p><p>A. CO2 B. CO C. BF3 D. More than 1 of the above.</p><p>29. In which of the following molecules does the central atom not follow the octet rule?</p><p>A. PCl3 B.CH4 C. H2O D. PF5</p><p>30. Which of the following atoms will be stable by having only 6 valence electrons.</p><p>A. B B. Br C. Be D. Rb</p><p>31. The shape of the BI3 molecule is called:</p><p>A. linear B. bent C. trigonal planar D. pyramidal E. tetrahedral</p><p>Short answer: There are several mistakes in the following molecule. Discuss each mistake and how to correct it. Redraw the structure correctly. </p><p>This is an example molecule. The one in the actual question is NOT identical, but it IS similar:</p><p>Br – H – O </p><p>Short answer: [Remember, you may use only your periodic table for this test.] Given 4 Formulas (similar to the modeling activity): Calculate the total valence electrons. Do the dot structure (with or without using dashes). Determine shape. Determine bond polarity. Determine molecular polarity. Determine intermolecular force.</p><p>Nomenclature/Formulas: [Remember, you may use only your periodic table for this test.]</p><p>Given 7 formulas, name each. </p><p>Given 7 names, write the formulas. Similar to the practice sheet.</p>