What is organic chemistry? Name at least three categories of compounds that are studied as a part of organic chemistry.

There are four main types, or classes, of organic compounds found in all living things: carbohydrates, lipids, proteins, and nucleic acids.

Explanation:

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.