Explain what a catalyst is and give an example of a transition as one.

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.

If you burn 46.6 g of hydrogen and produce 416 g of water, how much oxygen reacted

In one or two grammatically correct sentences, write a definition for the term molecule geometry