10 Differences Between exothermic and endothermic reaction

Exothermic vs Endothermic Reaction

Exothermic vs Endothermic Reaction

What is Exothermic?

An exothermic reaction is a chemical reaction that releases energy in the form of heat, light, or sound. It occurs when the products of the reaction have less energy than the reactants. Exothermic reactions are typically spontaneous and often result in an increase in temperature.

Examples of Exothermic Reactions:

  • Combustion reactions, such as burning wood or fuel.
  • Neutralization reactions, like the reaction between an acid and a base.
  • Oxidation reactions, such as rusting of iron.
  • Decomposition reactions, like the breakdown of hydrogen peroxide.

Uses of Exothermic Reactions:

  • Production of heat for cooking, heating, and energy generation.
  • Explosives and fireworks.
  • Thermal packs used to provide warmth in cold environments.
  • Several industrial processes, such as combustion engines and metallurgy.

What is Endothermic?

An endothermic reaction is a chemical reaction that absorbs energy from its surroundings. It occurs when the products of the reaction have more energy than the reactants. Endothermic reactions often result in a decrease in temperature.

Examples of Endothermic Reactions:

  • Evaporation of liquid.
  • Photosynthesis process in plants.
  • Melting of ice.
  • Reaction between citric acid and baking soda.

Uses of Endothermic Reactions:

  • Refrigeration and air conditioning systems.
  • Chemical cold packs used in sports injuries.
  • Endothermic welding processes.
  • In chemical reactions where cooling is required.

Differences between Exothermic and Endothermic Reaction:

Difference Area Exothermic Reaction Endothermic Reaction
Energy Transfer Release of energy Absorption of energy
Temperature Change Temperature usually increases Temperature usually decreases
Heat Flow Heat flows out Heat flows in
Reaction Spontaneity Typically spontaneous Non-spontaneous (requires external energy)
Product vs Reactant Energy Product energy is lower than reactant energy Product energy is higher than reactant energy
Examples Combustion, neutralization Evaporation, photosynthesis
Uses Cooking, energy generation Refrigeration, welding
Systems Burning fuel, exothermic reactions Photosynthesis, endothermic reactions
Effect on Surroundings Warms the surroundings Cools the surroundings
Common Examples Fire, explosions Cooking, melting


Exothermic and endothermic reactions are two types of chemical reactions that differ in their energy transfer, temperature change, and heat flow. Exothermic reactions release heat, while endothermic reactions absorb heat. They also have different effects on the surroundings and require different energy inputs. Understanding these differences allows us to harness these reactions for various applications in industries and everyday life.

People Also Ask:

  • 1. What is the main difference between exothermic and endothermic reactions?
  • The main difference between exothermic and endothermic reactions is the release or absorption of energy. Exothermic reactions release energy, while endothermic reactions absorb energy.

  • 2. How can exothermic reactions be used in everyday life?
  • Exothermic reactions are used in everyday life for cooking, heating, and energy generation. They are also responsible for the warmth from fire and the explosion of fireworks.

  • 3. What are some examples of endothermic reactions?
  • Examples of endothermic reactions include the evaporation of liquid, photosynthesis in plants, and the melting of ice.

  • 4. How are exothermic and endothermic reactions different in terms of temperature change?
  • Exothermic reactions typically result in an increase in temperature, while endothermic reactions usually lead to a decrease in temperature.

  • 5. What are the uses of endothermic reactions?
  • Endothermic reactions are used in refrigeration, welding, and chemical reactions that require cooling. They are also utilized in chemical cold packs for sports injuries.

Leave a Comment

content of this page is protected

Scroll to Top