Kinetic Molecular Theory (KMT) Postulates Quiz

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Questions and Answers

According to Kinetic Molecular Theory, what is the relationship between kinetic energy and temperature?

  • Kinetic energy is unrelated to temperature.
  • Kinetic energy remains constant regardless of temperature.
  • Kinetic energy increases as temperature increases. (correct)
  • Kinetic energy decreases as temperature increases.

In which state of matter are molecules held together by attractive forces and have very little empty space?

  • Plasma
  • Gas
  • Solid
  • Liquid (correct)

Which state of matter has molecules that are held rigidly in position?

  • Liquid
  • Plasma
  • Gas
  • Solid (correct)

What happens to the distance between molecules when transitioning from a liquid to a gas state?

<p>The distance increases. (C)</p> Signup and view all the answers

Which phase of matter is harder to compress than gases?

<p>Liquid (D)</p> Signup and view all the answers

What type of order characterizes many solids?

<p>Long-range order (A)</p> Signup and view all the answers

Which state of matter flows, can be poured, and assumes the shape of its container?

<p>Liquid (D)</p> Signup and view all the answers

What type of forces are responsible for the attractive interactions between polar molecules?

<p>Dipole-dipole forces (B)</p> Signup and view all the answers

Which type of force is significant only when atoms are close together?

<p>London dispersion forces (C)</p> Signup and view all the answers

What type of bond involves interactions between hydrogen and an electronegative atom like O, N, or F?

<p>Hydrogen bond (A)</p> Signup and view all the answers

Which force involves electrostatic interactions between a fixed dipole in one molecule and an ion in another?

<p>Ion-dipole forces (C)</p> Signup and view all the answers

Why are dipole-dipole forces stronger than London dispersion forces?

<p>Because they have a permanent uneven distribution of electrons (C)</p> Signup and view all the answers

What causes London Dispersion Forces to occur between nonpolar molecules?

<p>Permanent dipole moments induced by electron movement (C)</p> Signup and view all the answers

What factor influences the strength of dispersion forces in molecules?

<p>Size and diffuseness of the electron cloud (D)</p> Signup and view all the answers

Which molecule would likely have stronger London Dispersion Forces with another molecule?

<p>Iodine (I2) (C)</p> Signup and view all the answers

How does an increase in the number of atoms in a molecule affect its intermolecular forces?

<p>Increases the strength of dispersion forces (C)</p> Signup and view all the answers

What property of molecules determines their polarizability?

<p>Ease with which electron distribution can be distorted (B)</p> Signup and view all the answers

Flashcards

Kinetic Energy vs. Temperature

Kinetic energy increases as temperature increases, showing a direct relationship.

Liquid State

In this state, molecules are held together by attractive forces but can still move around.

Solid State

In this state, molecules are held rigidly in fixed positions.

Liquid to Gas: Molecular Distance

The space between molecules increases significantly when transitioning from liquid to gas.

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Compressibility: Liquid vs. Gas

Liquids are more difficult to compress compared to gases due to the closer proximity of molecules.

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Long-range Order

Many solids exhibit a highly ordered structure extending over a considerable distance.

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Liquid Properties

This state assumes the shape of its container and can be poured.

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Dipole-Dipole Forces

Attractive interactions between polar molecules caused by asymmetrical charge distributions.

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London Dispersion Forces: Range

These forces are significant only when atoms or molecules are extremely close to each other.

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Hydrogen Bond

A bond between hydrogen and an electronegative atom (O, N, or F) with partial charges.

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Ion-Dipole Forces

Electrostatic interactions between an ion and a polar molecule.

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Dipole-Dipole vs. London Dispersion

These forces involve permanent, uneven distributions of electrons, leading to stronger attractions.

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Cause of London Dispersion Forces

Temporary shifts in electron clouds create temporary dipoles, inducing attractions.

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Dispersion Force Strength Factors

A larger and more diffuse electron cloud means greater polarizability and stronger attractions.

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Stronger LDF Example

This molecule size and electron cloud are Larger, thus stronger dispersion force.

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Number of Atoms & Intermolecular Forces

Forces increase due to more surface area and electrons available for interaction.

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Polarizability

The ease at which electron distribution in a molecule can be distorted.

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