KINETIC MOLECULAR THEORY The Kinetic Molecular Theory explains

KINETIC MOLECULAR THEORY

The Kinetic Molecular Theory explains the behaviour of particles in a gas.

Solids & Liquids - small distance between particles - slow moving particles

Gases - large distance between particles - fast moving particles

Particles in Solids Liquids & Gases

solid liquid gas

Demo: Pepper on Water � If there are small distances between particles in a liquid, how can pepper sit on top of water?

Surface Tension � The water particles in the top layer attract one another to form a “water screen”

• • What happens when you touch the surface? The tension is broken

Demo : Bouncing Glass Beads • What Air Glass tube will happen when this glass tube of mercury and beads is heated? liquid mercury vapourizes & these faster moving particles carry the beads up the tube • Beads Mercury Heat source

Demo: Collapsing Pop Can � What will happen to a pop can when heated then quickly cooled?

Implosion! • • The hot air molecules move faster & out of the can The pressure inside the can is low, outside pressure is high, can crushes

KMT also predicts that…. � as the temperature increases, the motion of the particles increases.

What will happen… � If the ball is placed inside the ring at room temperature? � If the ball is placed inside the ring after it has been heated?

How easily can you compress �A solid? �A liquid? �A gas?