Ammonia, NH3, reacts with incredibly strong bases to produce the amide ion, NH2-. Ammonia can also react with acids to produce the ammonium ion, NH4+. (a) Which species (amide ion, ammonia, or ammonium ion) has the largest H¬N¬H bond angle? (b) Which species has the smallest H¬N¬H bond angle?
Ch.9 - Molecular Geometry and Bonding Theories
Chapter 9, Problem 37a
(a) Does CS2 have a dipole moment? If so, in which direction does the net dipole point?
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Molecular Geometry
Molecular geometry refers to the three-dimensional arrangement of atoms within a molecule. The shape of a molecule is determined by the positions of its atoms and the presence of lone pairs of electrons, which can affect bond angles and overall symmetry. Understanding the geometry of CS2 (carbon disulfide) is crucial for determining its polarity and dipole moment.
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Polarity and Dipole Moment
Polarity in molecules arises from differences in electronegativity between bonded atoms, leading to uneven distribution of electron density. A dipole moment is a vector quantity that represents the separation of positive and negative charges in a molecule. If a molecule has a net dipole moment, it indicates that it is polar, which is essential for understanding the behavior of CS2 in different environments.
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Symmetry and Nonpolar Molecules
Symmetry plays a critical role in determining whether a molecule is polar or nonpolar. A molecule can have polar bonds but still be nonpolar overall if its shape is symmetrical, allowing the dipole moments to cancel each other out. In the case of CS2, its linear geometry results in a symmetrical distribution of charge, leading to the conclusion that it does not have a net dipole moment.
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Related Practice
Textbook Question
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(a) Explain why BrF4- is square planar, whereas BF4- is tetrahedral.
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Textbook Question
(b) How would you expect the H¬X¬H bond angle to vary in the series H2O, H2S, H2Se? Explain. (Hint: The size of an electron pair domain depends in part on the electronegativity of the central atom.)
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Textbook Question
(b) It turns out that ozone, O3, has a small dipole moment. How is this possible, given that all the atoms are the same?
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Textbook Question
(c) Does the molecule BF2Cl have a dipole moment?
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Textbook Question
(a) Consider the following two molecules: PCl3 and BCl3. Which molecule has a nonzero dipole moment?
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