Solids, liquids, and gases are three common states of matter. in which of these physical states would a water molecule likely have the greatest energy?
a. solid
b. liquid
c. gas
d. the energy is identical in all three physical states.

The human eye contains a molecule called 11-cis-retinal that changes shape when struck with light of sufficient energy. the change in shape triggers a series of events that results in an electrical signal being sent to the brain that results in vision. the minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164 kj/mol.