Which change in state requires that energy be added to the substance?

1 Answer
Aug 24, 2017

The change from solid to liquid
The change from liquid to gas
The change from gas to plasma.


The changes that are endothermic require energy to be added to the substance.

Changing ice to liquid requires energy be added to break the bonds between the water molecules in a hexagonal crystalline shape.

Changing liquid water to gas requires energy to break the shifting inter molecular forces between the water molecules.

Changing gas to plasma requires a great deal of energy to break the atoms apart, separating the electrons from the neutrons and protons.