What is formed from joining positive and negative ions? Acids, bases, salts, or neutralization reactions?

Which statement describes both homogeneous mixtures and heterogeneous mixtures?

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.

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.