The three most familiar states of matter are solid, liquid and gas.
A change of state is the change of a substance fromone physical form of matter to another. When a substance undergoes a physical change, it does not change its density, just its appearence.
- Energy is Gained and Lost:
To change a substance to one state to another, energy must be added or removed. When a substance gains or loses energy, its temperature changes or its states changes. They do NOT happen at the same time.
- Particle Motion Changes:
During a change of state, the motion of the particles in matter changes. Particles can break away from each other and gain more freedom to move. Particles can also attract each other more strongly, and have less freedomto move.
- Energy is Conserved:
During a change of state, a substance must gain energy from the environment or ose energy to the environment, but the total amount of energy is conserved.
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