Textbook Question
Determine the kinds of intermolecular forces that are present in each element or compound. b. NCl3
Ch.11 - Liquids, Solids & Intermolecular Forces
Chapter 11, Problem 37a,b,c
Determine the kinds of intermolecular forces that are present in each element or compound. a. HCl b. H2O c. Br2
Verified step by step guidance1
Identify the types of intermolecular forces: Dispersion forces (also known as London forces), dipole-dipole interactions, and hydrogen bonding are the main types of intermolecular forces.
For HCl: Recognize that HCl is a polar molecule due to the difference in electronegativity between hydrogen and chlorine. This means it will have dipole-dipole interactions. Additionally, all molecules have dispersion forces.
For H2O: Identify that water is a polar molecule with a significant difference in electronegativity between hydrogen and oxygen. This allows for hydrogen bonding, which is a strong type of dipole-dipole interaction. Water also has dispersion forces.
For Br2: Understand that Br2 is a nonpolar molecule because it consists of two identical atoms sharing electrons equally. Therefore, it only exhibits dispersion forces.
Summarize the intermolecular forces: a. HCl has dipole-dipole interactions and dispersion forces. b. H2O has hydrogen bonding and dispersion forces. c. Br2 has dispersion forces.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
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 interactions is crucial for predicting the behavior of substances in different states and conditions.
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Hydrogen Bonding
Hydrogen bonding is a specific type of strong dipole-dipole interaction that occurs when hydrogen is covalently bonded to highly electronegative atoms like oxygen, nitrogen, or fluorine. This interaction significantly affects the properties of compounds, such as the high boiling point of water compared to other similar-sized molecules, due to the strong attraction between water molecules.
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Polarity
Polarity refers to the distribution of electrical charge over the atoms in a molecule. Polar molecules, like HCl and H2O, have a significant difference in electronegativity between their constituent atoms, leading to partial positive and negative charges. In contrast, nonpolar molecules, such as Br2, have an even distribution of charge, resulting in weaker London dispersion forces as their primary intermolecular interaction.
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