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Related Concept Videos

Basic Postulates of Kinetic Molecular Theory: Particle Size, Energy, and Collision02:43

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The ideal-gas equation, which is empirical, describes the behavior of gases by establishing relationships between their macroscopic properties. For example, Charles’ law states that volume and temperature are directly related. Gases, therefore, expand when heated at constant pressure. Although gas laws explain how the macroscopic properties change relative to one another, it does not explain the rationale behind it.
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Chirality02:25

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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
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Types Of Collisions - I01:04

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When two objects come in direct contact with each other, it is called a collision. During a collision, two or more objects exert forces on each other in a relatively short amount of time. A collision can be categorized as either an elastic or inelastic collision. If two or more objects approach each other, collide and then bounce off, moving away from each other with the same relative speed at which they approached each other, the total kinetic energy of the system is said to be conserved. This...
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When two or more objects collide with each other, they can stick together to form one single composite object (after collision). The total mass of the object after the collision is the sum of the masses of the original objects, and it moves with a velocity dictated by the conservation of momentum. Although the system's total momentum remains constant, the kinetic energy decreases, and thus such a collision is an inelastic collision. Most of the collisions between objects in daily life are...
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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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The kinetic molecular theory qualitatively explains the behaviors described by the various gas laws. The postulates of this theory may be applied in a more quantitative fashion to derive these individual laws.
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Chirality in molecular collision dynamics.

Andrea Lombardi1,2, Federico Palazzetti1

  • 1Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, Via Elce di Sotto 8, 06123, Perugia, Italy.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
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Chirality, the property of molecules existing in non-superimposable mirror-image forms, plays a crucial role in molecular collisions. This study explores chiral effects in collisions, offering insights into the origins of molecular homochirality.

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Area of Science:

  • Atomic and molecular physics
  • Biochemistry
  • Chemical physics

Background:

  • Chirality is fundamental in nature, impacting physics, life's origins, and biomolecular homochirality.
  • Chiral recognition and asymmetric synthesis are key in chemistry and pharmaceuticals.
  • Chiral discrimination is well-known with light but overlooked in molecular collisions.

Purpose of the Study:

  • To review advances in understanding chirality's role in molecular collisions.
  • To propose molecular beam experiments demonstrating chiral effects.
  • To suggest a stereo-directional origin for chiral selection.

Main Methods:

  • Review of existing research on chirality in molecular collisions.
  • Design and illustration of molecular beam experiments.
  • Theoretical suggestions for stereo-directional chiral selection.

Main Results:

  • Chirality significantly influences molecular collisions.
  • Experimental designs are proposed to observe chiral effects.
  • A framework for understanding the stereo-directional origin of chiral selection is suggested.

Conclusions:

  • Chirality is an underappreciated factor in molecular collision dynamics.
  • Experimental evidence for chiral effects in collisions can be obtained.
  • Understanding chiral selection mechanisms is vital for origins of life studies.