Adrenaline is a known chemical with a certain formula and structure. Its effects and actions are well known as part of biological chemistry, and can be readily predicted, reversed or duplicated.
Psychology is what the brain does and why it does it. Personality and similar subjects are included in psychology. Chemistry is a science that largely involves atoms and elements. They are sort of...
Alchemy is the predecessor to chemistry. Many discoveries by alchemist (especially their instruments) were later used in chemistry. The key difference between the two is that alchemy was more...