Matter undergoes phase change when heated of cooled. Phase change therefore is accompanied by energy exchange and transformation. When phase change takes place in a closed container, changes in the physical properties and characteristics also accompany it.


M4 Chemistry Matter II: State and Energy. Powerpoint slides on the relationship between state of matter and energy content of particles in a sample of the matter.

The Discrepant Event

A coin with some saliva is placed at the mouth of a wine bottle containing some wine. The bottle then is placed inside a beaker with hot water. Watch the video to see what happens next.

And the question is: why did the coin “dance”?

Concepts involved:

  • heat transfer, boiling/evaporation, pressure, expansion.

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