Iron corrodes because turns iron into ions through the process of water, reduction
water, oxidation
iron(iii) oxide, oxidation
iron(iii) oxide, reduction

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.

Word equation for k(s)+h2o(l) yield koh(aq) + h2(g)

In which reaction is precipitation occurring?