Areaction is spontaneous if delta g is
1)positive
2)negative
3)zero

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.

What produces wave a)sound b) heats c)transfer of energy d)vibrations

The biosphere of the earth is made up of what compound? organic or inorganic?