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Related Concept Videos

Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Solubility of Ionic Compounds02:55

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Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
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Ionic Strength: Overview01:12

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The ionic strength of a solution is a quantitative way of expressing the total electrolyte concentration of a solution. This concept was first introduced in 1921 by two American physical chemists, Gilbert N. Lewis and Merle Randall, while describing the activity coefficient of strong electrolytes. During the calculation of ionic strength (I or μ), all the cations and anions are considered. However, the concentration (c) of an ion with a greater charge number (z) has a greater contribution...
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Area of Science:

  • Planetary Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Ice giant planets (Uranus, Neptune) and sub-Neptune exoplanets are primarily composed of hydrogen, carbon, nitrogen, and oxygen.
  • The behavior of water (H2O), ammonia (NH3), and methane (CH4) under high pressure and temperature is crucial for understanding planetary interiors but remains poorly understood.

Purpose of the Study:

  • To investigate the high-pressure, high-temperature behavior of thirteen key H-C-N-O compounds.
  • To elucidate the potential states and transitions these compounds undergo within ice giant planets.

Main Methods:

  • Utilized ab initio computer simulations to model thirteen H-C-N-O compounds.
  • Analyzed the structural and dynamic properties of these compounds at elevated temperatures and pressures.

Main Results:

  • Demonstrated that thirteen H-C-N-O compounds adopt a superionic state at high temperatures, with mobile hydrogen ions within a stable heavy-ion sublattice.
  • Observed a novel doubly superionic state in four compounds at even higher temperatures, where both hydrogen ions and some heavy nuclei become mobile.
  • Identified first-order phase transitions for both superionic states and melting.

Conclusions:

  • The superionic and doubly superionic states can significantly impact the internal structure of ice giants.
  • These phase transitions may lead to the formation of additional mantle layers and influence convective patterns in planets like Uranus and Neptune.