Study set 8 (test 3)

18. Which of the following compounds would have a linear molecular geometry? 1. N2 2. H2S 3. CO2 a) 1 and 3 only b) 2 and 3 only c) 1 and 2 only d) 1,2 and 3 e) neither 1, 2,or 3

a) 1 and 3 only

1. Which molecule listed below has a nonpolar covalent bond? a) H2 b) NaCl c) H2O d) all of the compounds e) none of the compounds

a) H2

10. When calculating the number of electrons for the Lewis structure of a polyatomic ion, you must add one electron for each negative charge and subtract one electron for each positive charge. a) True b) False

a) True

13. The VSEPR theory predicts that the angle between the central carbon atom and the two oxygen atoms in CO2 measures 180°. a) True b) False

a) True

6. Lewis structures only use the valence electrons in determining the bonding. a) True b) False

a) True

9. The double bond is shorter and stronger than a single bond. a) True b) False

a) True

20. The ability of an element to attract electrons within a covalent bond is _________. a) electronegativity b) dipole moment c) coulombic attraction d) nonpolar covalent e) polar covalent

a) electronegativity

16. What is the electron geometry if you have 2 electron groups around the center atom? a) linear b) trigonal bipyramidal c) trigonal planar d) tetrahedral e) not enough information

a) linear

8. Which sequence below represents the proper order of increasing bond strength? a) single < double < triple b) single < triple < double c) double < single < triple d) triple < double < single e) none of the above

a) single < double < triple

15. What is the electron geometry if you have 4 electron groups around the center atom? a) tetrahedral b) trigonal planar c) linear d) trigonal bipyramidal e) not enough information

a) tetrahedral

19. The elements with the highest electronegativity values tend to be found in the: a) upper right-side of the periodic table. b) center of the periodic table. c) lower left-side of the periodic table. d) upper left-side of the periodic table. e) lower right-side of the periodic table.

a) upper right-side of the periodic table.

21. Which of the following characteristics apply to PCl3? 1. nonpolar molecule 2. polar bonds 3. trigonal-pyramidal molecular geometry 4. sp2 hybridized a) 1 and 2 b) 2 and 3 c) 3 and 4 d) 1, 2, and 3 e) 1, 2, 3, and 4

b) 2 and 3

14. The VSEPR theory predicts that the H-C-H angle in CH4 measures 120°. a) True b) False

b) False

2. Which molecule listed below has a polar covalent bond? a) H2 b) H2O c) NaCl d) all of the compounds e) none of the compounds

b) H2O

4. The electronegativity value for N is 3.0 and that for O is 3.5. Based on these values, which of the following statements is TRUE about the compound NO? a) NO is an ionic compound. b) NO is a polar covalent compound. c) NO is a pure covalent compound. d) There is not enough enough information to determine the nature of NO. e) None of the above statements is true.

b) NO is a polar covalent compound.

5. Which term matches the definition: A separation of charge within a bond? a) nonpolar covalent b) dipole moment c) coulombic attraction d) pure covalent e) electronegativity

b) dipole moment

11. The correct Lewis structure for BF3 would have exactly: a) 1 triple bond. b) 2 double bonds. c) no double bonds. d) 1 double bond. e) none of the above

c) no double bonds.

22. What hybridization change does the carbon atom undergo in the combustion of methane? CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) a) sp → sp2 b) sp2 → sp3 c) sp3 → sp d) sp2 → sp

c) sp3 → sp

The Lewis structure for carbon monoxide is :C≡O: This structures shows: a) 4 lone pairs and 1 bonding pair. b) 4 lone pairs and 3 bonding pairs. c) 2 lone pairs and 1 bonding pair. d) 2 lone pairs and 3 bonding pairs. e) none of the above

d) 2 lone pairs and 3 bonding pairs.

12. Which of the following compounds have resonance structures? a) CH4 b) H2O c) NH3 d) O3 e) None of the compounds have resonance structures.

d) O3

3. Which molecule listed below is a polar molecule? a) HCN b) H2O c) NH3 d) all of the compounds e) none of the compounds

d) all of the compounds

17. What is the molecular geometry if you have 3 single bonds and 1 lone pair around the central atom? a) bent b) linear c) tetrahedral d) trigonal pyramidal e) not enough information

d) trigonal pyramidal