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Is molecular weight an important contributor to intermolecular forces?

Is molecular weight an important contributor to intermolecular forces?

Explanation: …and the more electrons it contains, the LARGER, and the MORE POLARIZABLE the electron cloud of the molecule is, and thus the GREATER the possibility of intermolecular interaction by dispersion forces.

Does increased molecular weight increase intermolecular forces?

Within a series of compounds of similar molar mass, the strength of the intermolecular interactions increases as the dipole moment of the molecules increases, as shown in Table 7.2.

How does molecular structure relate to intermolecular forces?

Intermolecular forces are electrostatic in nature and include van der Waals forces and hydrogen bonds. Molecules in liquids are held to other molecules by intermolecular interactions, which are weaker than the intramolecular interactions that hold the atoms together within molecules and polyatomic ions.

How does molecular size affect intermolecular forces?

Molecular Size Larger and heavier atoms and molecules exhibit stronger dispersion forces than smaller and lighter ones. In a larger atom or molecule, the valence electrons are, on average, farther from the nuclei than in a smaller atom or molecule. They are less tightly held and can more easily form temporary dipoles.

How does molecular weight affect diffusion?

Mass of the molecules diffusing: Heavier molecules move more slowly; therefore, they diffuse more slowly. The reverse is true for lighter molecules. Temperature: Higher temperatures increase the energy and therefore the movement of the molecules, increasing the rate of diffusion.

What causes intermolecular forces?

Intermolecular forces are electrostatic in nature; that is, they arise from the interaction between positively and negatively charged species. Like covalent and ionic bonds, intermolecular interactions are the sum of both attractive and repulsive components.

How is molecular weight related to atomic weight?

The molecular weight of a compound is the sum of the atomic weights of the atoms in the molecules that form these compounds. Example: The molecular weight of the sugar molecule found in cane sugar is the sum of the atomic weights of the 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms in a C12H22O11 molecule.

How do intermolecular forces affect the properties of molecular covalent substances?

The rule of thumb is that the stronger the intermolecular forces of attraction, the more energy is required to break those forces. This translates into ionic and polar covalent compounds having higher boiling and melting points, higher enthalpy of fusion, and higher enthalpy of vaporization than covalent compounds.

Which substance has the weakest intermolecular forces?

Oil- Only London Dispersion Forces (the weakest intermolecular force)

  • Water- London Dispersion, Dipole-Dipole, and Hydrogen Bonding.
  • What is the relationship between molecular weight and diffusion explain your answer at a molecular level?

    What is the relationship between molecular weight and diffusion quizlet?

    the lower the molecular weight, the faster the rate of diffusion. the higher the molecular weight, the slower the rate of diffusion.