Which balanced equation represents a chemical change?

A.

H2O (l)  → H2O (s) + energy

B.

2 H2O (l) + energy → 2 H2 (g) + O2 (g)

C.

H2O (g)  → H2O (l) + energy

D.

H2O (l) + energy → H2O (g)

Okay, so what you first do with this type of question is think about what a chemical change is. A chemical change is a change that can not be reversed. A physical change is something that can be reversed or done using temperature. e. x. Water freezing into ice is a physical change, where as combining vinegar and baking soda together releases a gas, which is chemical, or iron rusting in the presence of oxygen. Which one of these equations has one chemical molecule set that produces a different set?