Changes of state

MELTING AND BOILING SEC 3 PHYSICS

On the Molecular Level ,[object Object],[object Object]

On a Molecular Level (cont’d) ,[object Object],[object Object]

So what do we see? ,[object Object],[object Object],[object Object]

Changes in States melting Boiling CONDENSATION FREEZING Gain in heat Loss in heat Solid Gas Liquid

MELTING AND SOLIDIFICATION ,[object Object],[object Object],[object Object],[object Object]

MELTING AND SOLIDIFICATION ,[object Object],[object Object],[object Object]

The Temperature-time Graph temperature time This part of the graph shows a constant temperature which means this is when the substance is changing state

Effect of Impurities on Freezing Point ,[object Object]

Effect of Impurities on Freezing Point ,[object Object],[object Object],[object Object],[object Object],[object Object]

Effect of Impurities on Freezing Point The reverse situation would be true. (When melting.) A (no salt added) B (salt added) Ice cube A would melt at 0 o C. But B would melt(turn into liquid) at a temperature even lower.

Effect of Pressure on Melting Point ,[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],Effect of Pressure on Melting Point

boiling AND condensation ,[object Object],[object Object],[object Object],[object Object]

Boiling AND condensation ,[object Object],[object Object],[object Object]

Effect of Impurities on Boiling Point ,[object Object],[object Object]

Effect of Pressure On Boiling Point ,[object Object],[object Object],[object Object],[object Object]

Specific Latent Heat ,[object Object],[object Object],[object Object]

Specific Latent Heat ,[object Object],[object Object],[object Object],[object Object]

Specific Latent Heat of Fusion ,[object Object],[object Object],[object Object]

Specific Latent Heat of Vaporisation ,[object Object],[object Object],[object Object]

Example: ,[object Object],Solution: L v = m l v 4400 = 2 ( l v ) l v = 4400 / 2 l v =2200 Jkg -1

Evaporation ,[object Object],[object Object]

Differences ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Evaporation Boiling

Factors Affecting rate of Evaporation ,[object Object],[object Object]

Changes of state

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Changes of state