Background
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.
Resources:
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.
