Textbook Question
Predict whether each of the following molecules is polar or nonpolar: (a) IF, (b) CS2, (c) SO3, (d) PCl3, (e) SF6, (f) IF5.
Ch.9 - Molecular Geometry and Bonding Theories
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232
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Table of contents
- Ch.1 - Introduction: Matter, Energy, and Measurement177
- Ch.2 - Atoms, Molecules, and Ions231
- Ch.3 - Chemical Reactions and Reaction Stoichiometry216
- Ch.4 - Reactions in Aqueous Solution189
- Ch.5 - Thermochemistry175
- Ch.6 - Electronic Structure of Atoms168
- Ch.7 - Periodic Properties of the Elements150
- Ch.8 - Basic Concepts of Chemical Bonding177
- Ch.9 - Molecular Geometry and Bonding Theories200
- Ch.10 - Gases179
- Ch.11 - Liquids and Intermolecular Forces113
- Ch.12 - Solids and Modern Materials154
- Ch.13 - Properties of Solutions157
- Ch.14 - Chemical Kinetics199
- Ch.15 - Chemical Equilibrium128
- Ch.16 - Acid-Base Equilibria164
- Ch.17 - Additional Aspects of Aqueous Equilibria163
- Ch.18 - Chemistry of the Environment105
- Ch.19 - Chemical Thermodynamics164
- Ch.20 - Electrochemistry171
- Ch.21 - Nuclear Chemistry122
- Ch.22 - Chemistry of the Nonmetals82
- Ch.23 - Transition Metals and Coordination Chemistry79
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry16
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Not the one you use?Change textbook
Chapter 9, Problem 43b
Dichloroethylene (C2H2Cl2) has three forms (isomers), each of which is a different substance. (b) Which of these isomers has a zero dipole moment?
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Understand that dichloroethylene (C2H2Cl2) has three isomers: 1,1-dichloroethylene, cis-1,2-dichloroethylene, and trans-1,2-dichloroethylene.
Recall that a molecule's dipole moment is determined by the vector sum of the individual bond dipoles. A zero dipole moment means the bond dipoles cancel each other out.
Visualize or draw the structures of the three isomers: 1,1-dichloroethylene has both Cl atoms on the same carbon, cis-1,2-dichloroethylene has Cl atoms on adjacent carbons on the same side, and trans-1,2-dichloroethylene has Cl atoms on adjacent carbons on opposite sides.
Analyze the symmetry of each isomer: trans-1,2-dichloroethylene is symmetrical, which allows the dipoles to cancel out, resulting in a zero dipole moment.
Conclude that trans-1,2-dichloroethylene is the isomer with a zero dipole moment due to its symmetrical structure.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Isomerism
Isomerism refers to the phenomenon where two or more compounds have the same molecular formula but different structural arrangements or spatial orientations. In the case of dichloroethylene (C2H2Cl2), the isomers can differ in the position of the chlorine atoms or the arrangement of the carbon-carbon double bond, leading to distinct chemical and physical properties.
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Isomerism in Coordination Complexes Example
Dipole Moment
The dipole moment is a measure of the separation of positive and negative charges in a molecule, indicating its polarity. A molecule with a dipole moment has an uneven distribution of electron density, resulting in a positive and a negative end. Molecules with symmetrical structures can have a zero dipole moment, as the individual bond dipoles cancel each other out.
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Molecular Symmetry
Molecular symmetry plays a crucial role in determining the dipole moment of a molecule. Symmetrical molecules, such as the trans isomer of dichloroethylene, can have their dipole moments cancel out due to equal and opposite charge distributions, resulting in a net dipole moment of zero. Understanding the symmetry of a molecule helps predict its physical properties, including polarity.
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Related Practice
Textbook Question
(a) Consider the following two molecules: PCl3 and BCl3. Which molecule has a nonzero dipole moment?
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Textbook Question
Predict whether each of the following molecules is polar or nonpolar: (a) CCl4, (b) NH3, (c) SF4, (d) XeF4, (e) CH3Br, (f) GaH3.
Textbook Question
Dihydroxybenzene, C6H6O2, exists in three forms (isomers) called ortho, meta, and para:
Which of these has a nonzero dipole moment?
Textbook Question
Dichloroethylene (C2H2Cl2) has three forms (isomers), each of which is a different substance. (c) How many isomeric forms can chloroethylene, C2H3Cl, have? Would they be expected to have dipole moments?