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

1 Answer
Aug 24, 2017

Answer:

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

Explanation:

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.