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Ch.11 - Liquids, Solids & Intermolecular Forces
Tro - Chemistry: A Molecular Approach 4th Edition
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Tutti i libri di testoTro 4th EditionCh.11 - Liquids, Solids & Intermolecular ForcesProblema 36c
Capitolo 11, Problema 36c

Determine the kinds of intermolecular forces that are present in each element or compound. c. SiH4

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Identify the molecular structure of SiH_4. Silicon (Si) is the central atom bonded to four hydrogen (H) atoms, forming a tetrahedral shape.
Determine the polarity of the Si-H bonds. Silicon and hydrogen have different electronegativities, but the difference is not large enough to make the bonds significantly polar.
Assess the overall polarity of the SiH_4 molecule. Due to its symmetrical tetrahedral shape, any dipole moments in the Si-H bonds cancel out, making SiH_4 a nonpolar molecule.
Identify the types of intermolecular forces present in nonpolar molecules. Nonpolar molecules like SiH_4 primarily exhibit London dispersion forces (also known as van der Waals forces).
Conclude that the only intermolecular forces present in SiH_4 are London dispersion forces, which are the weakest type of intermolecular force.

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Intermolecular Forces

Intermolecular forces are the attractive forces between molecules that influence physical properties such as boiling and melting points. These forces include hydrogen bonding, dipole-dipole interactions, and London dispersion forces. Understanding these forces is crucial for predicting the behavior of substances in different states of matter.
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Intermolecular vs Intramolecular Forces

Molecular Polarity

Molecular polarity refers to the distribution of electrical charge across a molecule, which determines whether it has a positive or negative end. Polar molecules have a significant difference in electronegativity between atoms, leading to dipole moments, while nonpolar molecules have an even distribution of charge. The polarity of a molecule affects the type of intermolecular forces it can exhibit.
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Molecular Polarity

Silane (SiH4) Structure

Silane (SiH4) is a molecular compound consisting of silicon and hydrogen. It has a tetrahedral geometry, with silicon at the center and four hydrogen atoms at the corners. Due to its symmetrical structure and nonpolar Si-H bonds, SiH4 is a nonpolar molecule, primarily exhibiting London dispersion forces as its intermolecular force.
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Resonance Structures
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