When the original matter can be obtained back, we call the change _____.
reversible
When we can’t have the original matter back, we call the change _____.
irreversible.
For matter to change, we need _____.
energy
Changes can be caused by______ matter up or ______ it down.
heating or cooling
When we heat up matter from solid to liquid, this is called _____.
melting
When we cool down matter from liquid to solid, this is called _____.
solidification or freezing
When we heat up matter and change it from liquid to gas, this is called _____.
evaporation
When we cool down matter changing it from gas to liquid, this is called_____.
condensation
This change is _____.
reversible
This change is _____.
irreversible
Matter can exist in three different states: ___, ___, or ___.
solid liquid gas
Evaporation happens when a liquid is ___.
heated
The heat gives the liquid’s molecules more ___.
energy
Energy causes the molecules to move ____.
faster
Condensation happens when molecules in a gas ___.
cool down
As the molecules cool down, they lose energy, so they ___.
slow down
