Another possibility is that only a portion of one molecule is transferred to the other molecule. This type of reaction occurs, for example, in redox and acid-base reactions. In redox reactions, the transferred particle is an electron, whereas in acid-base reactions it is a proton.
Psychology is the study of mind and behavior. It is an academic discipline and an applied science which seeks to understand individuals and groups by establishing general principles and researching specific cases.
Psychologists are trained in the evaluation and treatment of emotional problems, including emotional/behavioral issues which sometimes arise in children with learning differences. Psychologists work with individuals and families to help resolve problems which disrupt family life.