Kinetic Molecular Theory Worksheet

I. MOLECULES IN MOTION:

A. Kinetic Molecular Theory (KMT) = the idea that particles of

matter are always in motion and that this motion has

consequences.

theory developed in the late 19

century to account for the

behavior of the atoms and molecules that make up matter

based on the idea that particles in all forms of matter are

always in motion and that this motion has consequences

can be used to explain the properties of solids, liquids, and

gases in terms of the energy of particles and the forces that

act between them

• 3 assumptions of KMT:

1. All matter (solid, liquid, gas) is made of particles (atoms,

ions, molecules)

2. Particles are in constant motion (electrons move)

random

• Particles of a GAS travel in completely

motion

• Particles of a LIQUID appear to vibrate around

moving

points

fixed

• Particles of a SOLID appear to vibrate around

points

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