What is the difference between endothermic reaction and exothermic reaction?

1, decomposition reaction-endothermic reaction

Decomposition reaction is generally endothermic, for example, sodium bicarbonate is decomposed into sodium carbonate, water and carbon dioxide by heating; Calcium carbonate can be decomposed into calcium oxide and carbon dioxide at high temperature.

2. Some chemical reactions-endothermic reactions

If carbon and carbon dioxide react at high temperature to produce carbon monoxide, it is an endothermic reaction.

3. Combustion reaction-exothermic reaction

When hydrocarbons react with oxygen to produce carbon dioxide and water, a combustion reaction usually occurs. Combustion reaction is a process in which combustible components in the mixture react rapidly with oxygen to form a flame and emit a lot of heat and strong light.

4. Neutralization reaction-exothermic reaction

Acid-base neutralization reaction refers to the reaction that acid and alkali exchange components, produce salt and water, and release heat. The essence of neutralization reaction is that hydrogen ions and hydroxyl groups combine to produce water, or acid-base reaction produces salt and water.

5, aluminothermic reaction-exothermic reaction

Aluminothermic method is a method to obtain high melting point metals by using the reducibility of aluminum. It can be simply considered as the reaction of aluminum with some metal oxides (such as iron oxide, chromium oxide, manganese dioxide, etc.). ) at high temperature. Thermite reaction is often used to smelt high melting point metals. It is an exothermic reaction with magnesium rod as igniter and potassium chlorate as combustion improver.

Baidu encyclopedia-endothermic reaction

Baidu encyclopedia-exothermic reaction