Students demonstrate their understanding of Physical Change by
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Constructing their own models that represent the states of matter at the molecular level and explaining the effect of increased and decreased heat energy on the motion and arrangement of molecules.
Observing the physical processes of evaporation and condensation, and accounting for the disappearance and appearance of liquid water in terms of molecular motion and conservation of mass.
Increased temperature of substances causes increased motion of the atoms and molecules in the substance.
As the temperature and motion of molecules in a substance increase, the space between molecules in the substance increases possibly causing a change in state.