A chemical reaction that doesn't release energy is an endothermic reaction. There are few reactions that are endothermic compared to exothermic reactions (reactions that release energy as heat). Endothermic reactions actually take in heat from the environment and that is why you see a temperature drop.
Examples of endothermic reactions:
Electrolysis
A reaction between ethanoic acid and sodium carbonate
A thermal decomposition reaction (as you put heat into the reaction to break something down)
Hope this helped.
Exothermic reactions
The general term for a chemical reaction that releases heat is an exothermic reaction. The energy released is called enthalpy.A reaction that releases energy is called an exothermic reaction.
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
All chemical reactions that release energy in the form of heat are called exothermic reactions.
combustion
The general term for a chemical reaction that releases heat is an exothermic reaction.
An exothermic reaction is a chemical reaction that releases energy in the form of heat. The energy released during the reaction increases the temperature of the surroundings. This type of reaction commonly involves the formation of bonds which releases more energy than is required to break the existing bonds.
The energy is conserved in a chemical reaction.
When the value of G is negative in a chemical reaction, it indicates that the reaction is spontaneous and releases energy.
an exothermic reaction is a chemical reaction that releases energy, usually in the form of heat
An exothermic reaction
exothermic reaction. This type of reaction releases energy to the surroundings as heat.