Maslow's Hierarchy of Needs. Definition. Maslow's hierarchy of needs is a theory of motivation and personality developed by the psychologist Abraham H. Maslow (1908â1970). Maslow's hierarchy explains human behavior in terms of basic requirements for survival and growth.
When you use ice to cool the ingredients for ice cream, the energy is absorbed from the ingredients and from the outside environment (like your hands, if you are holding the baggie of ice!).
Digestion of food releasing energy = exothermic reaction. Melting ice absorbing energy = endothermic reaction. Exothermic releases energy. Endothermic absorbs energy. That is the difference. The example you have given with sodium and chlorine gas is generating heat, (releasing energy) which makes it exothermic. it's not explosive...cold water and sodium is explosive...it's exothermic because heat is coming out...and endothermic is when you have to provide heat...e.g.