In the symbol (4/2)he, the superscript 4 is the for helium, and the subscript 2 is the for helium.

What is the value of keq for the reaction expressed in scientific notation

What forms when chemical reactions combine pollution with sunlight?

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.