Question

13. Explain the relationship between intermolecular attractions and the kinetic
energy of molecules in determining the physical state of a substance?​

Answer 1

Answer:

Two factors determine whether a substance is a solid, a liquid, or a gas:

The kinetic energies of the particles (atoms, molecules, or ions) that make up a substance. Kinetic energy tends to keep the particles moving apart.

The attractive intermolecular forces between particles that tend to draw the particles together.

If the average kinetic energy is greater than the attractive forces between the particles, a substance will not condense to form a liquid or a solid. If the kinetic energy is less than the attractive forces, a liquid or solid will form.

Microscopic view of a gas

The average kinetic energy of the particles in a gas is great enough to overcome the forces of attraction between them. The molecules of a gas move apart when they collide.

Microscopic view of a liquid

The average kinetic energy of the particles in a liquid (or solid) is small enough that the forces of attraction between them is sufficient to hold the particles close together. The molecules in a liquid (or solid) do not move apart.

Types of Attractive Forces:-

There are several types of attractive intermolecular forces:

• Dipole-dipole forces,
• London dispersion forces,
• Hydrogen bonding, and
• Induced-dipole forces

The first three forces are also collectively called van der Waals forces. All molecular and intermolecular attractive forces are electrostatic in nature. That is, they involve attractions between positive and negative species. The strengths of these attractive forces vary widely, though usually the intermolecular forces between small molecules are weak compared to the intramolecular forces that bond atoms together within a molecule.

All of the intermolecular forces that hold a liquid together are called cohesive forces

Explanation:

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Answer 2

Answer:



Explanation:

The inter molecular attraction and kinetic energy plays vital role in determining the physical state of a matter, as the matter having more intermolecular attraction will keep the molecules closer to each other and will make it compact, due to less space the kinetic energy will also be less and the matter will be solid(ex- solids) . But if a matter is having a less intermolecular attraction the molecules will be far apart from each other and the kinetic energy will be high, thus making the matter non solid (ex- water, gas).