Exothermic means that the chemical reaction produces heat as part of that reaction. The heat given off is usually detectable by a change in temperature while the two chemicals are reacting.
The word exothermic means accompanied by the release of heat when speaking of a reaction or process. When speaking of a compound, exothermic means formed from its constituent elements with a release of heat. A synonym for the word exothermic is exothermal.
An exothermic reaction is a chemical reaction that releases energy in the form of light or heat. It is the opposite of an endothermic reaction.
Expressed in a chemical equation: reactants → products + energy
An exothermic reaction is a chemical or physical reaction that releases heat. It gives out energy to its surroundings. The energy needed for the reaction to occur is less than the total energy released.
When using a calorimeter...