Physical science
Chapter 3 Section 2
Changes of State
P.84
Key Ideas
•What happens when a substance
changes from one state to another ?
•What happens to mass and energy
during physical and chemical
changes?
Gas
Solid
Melting
Freezing
liquid
Energy and changes of state
The identity of a substance doesn’t
change during a change in the state ,
but the energy of a substance does
change