© 2012 Pearson Education, Inc. Molecular Geometry © 2012 Pearson Education, Inc.
In the Lewis structure for sulfur, how many dots should be around the symbol “S”? 10.1 6 4 8 2 3 Answer: a
When electrons are completely transferred from one atom to another, the bond between the ions is called 10.2 polar covalent. ionic. polar ionic. nonpolar covalent. covalent. Answer: b
Use Lewis theory to predict the chemical formula of the product formed by the reaction between aluminum and oxygen. 10.3 AlO Al3O Al3O2 Al2O3 Al3O3 Answer: d
How many valence electrons are there in one silicon atom? 10.5 3 6 14 4 8 Answer: d
How many electrons must a phosphorus atom gain in order to have a full valence shell? 10.6 2 3 1 5 Answer: b
How many electrons are there in the outer shell of an oxide ion? 10.7 8 2 4 6 Answer: a
How many bonding pairs of electrons are in one molecule of ammonia, NH3? 10.9 1 2 3 4 Answer: c
How many lone pairs of electrons are in one molecule of carbon tetrachloride? 10.10 4 6 8 12 Answer: e
Which of the following contains one or more double bonds? 10.11 F2 N2 CN– CO SiO2 Answer: e
How many lone pairs are around the central atom in the ammonium ion? 10.13 1 4 12 16 Answer: c
What is the bond angle in a sulfur dioxide molecule? 10.14 180° 120° 90° 109.5° 104° Answer: b
What is the electron geometry of boron trifluoride? 10.15 Linear Trigonal planar Tetrahedral Trigonal pyramidal Bent Answer: b
What is the molecular geometry of NH2–? 10.16 Linear Trigonal planar Tetrahedral Trigonal pyramidal Bent Answer: e
What is the electron geometry of a compound when the central atom is surrounded by 3 single bonds and 1 lone pair? 10.17 Linear Trigonal planar Tetrahedral Trigonal pyramidal Bent Answer: c
Which of the following has a central atom that often does not obey the octet rule? 10.19 CH4 BF3 CCl4 NO3 NH4+ Answer: b
Which of the following contains a nonpolar, purely covalent bond? 10.20 NH3 CaCl2 I2 CO2 CO Answer: c
Without using a table of electronegativity, arrange the following elements in order of increasing electronegativity: Cl, Te, Se, Sr, Ba 10.23 Cl, Te, Se, Sr, Ba Cl, Te, Se, Ba, Sr Ba, Sr, Te, Se, Cl Sr, Ba, Te, Se, Cl Ba, Sr, Se, Te, Cl Answer: c
Which of the following has a bent molecular geometry? 10.27 HCN CO2 HF CH4 Two of the above None of the above Answer: f
Which of the following will exhibit trigonal pyramidal molecular geometry? 10.28 BH3 NO3– NH3 CO32– None of the above Answer: c