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Related Concept Videos

Temperature Dependence on Reaction Rate02:55

Temperature Dependence on Reaction Rate

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The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
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Phase Transitions: Melting and Freezing02:39

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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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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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SN2 Reaction: Transition State02:26

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An SN2 reaction of an alkyl halide is a single-step process in which bond formation between the nucleophile and the substrate and bond breaking between the substrate and the halide occurs simultaneously through a transition state without forming an intermediate.
When the nucleophile approaches the electrophilic carbon with its lone pairs, the halide acts as a leaving group and moves away with the electron-pair bonded to the carbon. Dotted partial bonds represent the bonds being formed or broken...
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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Thermal Sigmatropic Reactions: Overview01:16

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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in...
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Spatial Separation of Molecular Conformers and Clusters
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Cold state-selected molecular collisions and reactions.

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Researchers are achieving quantum control over chemical reactions using ultracold molecules. This allows for precise studies of scattering dynamics at the most fundamental level, opening new frontiers in quantum chemistry.

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Area of Science:

  • Atomic Physics
  • Quantum Chemistry
  • Chemical Dynamics

Background:

  • Recent advancements in producing cold and ultracold molecules are revolutionizing chemical reaction studies.
  • Traditional methods often involve perturbing rare-gas cluster shells, limiting quantum mechanical investigations.

Purpose of the Study:

  • To investigate chemical reactions and scattering dynamics at the quantum scattering limit.
  • To enable the observation and control of state-to-state collision rates in a simplified regime.

Main Methods:

  • Utilizing techniques for producing cold and ultracold molecules without rare-gas clusters.
  • Performing experiments with nonthermal molecular distributions in specific quantum states.

Main Results:

  • Enabling the study of chemical reactions and scattering with minimal contributing partial waves.
  • Achieving control over state-to-state collision rates in a computationally accessible regime.

Conclusions:

  • These advancements facilitate the most elementary studies of scattering and reaction dynamics.
  • The findings pave the way for a deeper understanding of quantum chemical processes.