what is the difference between exothermic reaction nd endothermic reaction...??...plz...give a brife explanation of it..

reaction in which energy is released is called exothermic reaction

reaction in which energy is absorbed is called endothermic reaction

1. exothermic reaction:- reaction in which heat is released out along with the formation of product are called exothermic reaction.

for example:-burning of natural gas.

2. endothermic reaction:-reaction in which heat is taken along with the formation of products are called endothermic reactions.

for example:- glucose dissolve in water.

Many chemical reactions release energy in the form of heat, light, or sound. These are exothermic reactions. Exothermic reactions may occur spontaneously and result in higher randomness or entropy (ΔS > 0) of the system. They are denoted by a negative heat flow (heat is lost to the surroundings) and decrease in enthalpy (ΔH < 0). In the lab, exothermic reactions produce heat or may even be explosive.

There are other chemical reactions that must absorb energy in order to proceed. These are endothermic reactions. Endothermic reactions cannot occur spontaneously. Work must be done in order to get these reactions to occur. When endothermic reactions absorb energy, a temperature drop is measured during the reaction. Endothermic reactions are characterized by positive heat flow (into the reaction) and an increase in enthalpy (+ΔH).

Examples of Endothermic and Exothermic Processes

Photosynthesis is an example of an endothermic chemical reaction. In this process, plants use the energy from the sun to convert carbon dioxide and water into glucose and oxygen. This reaction requires 15MJ of energy (sunlight) for every kilogram of glucose that is produced:

sunlight + 6CO₂(g) + H₂O(l) = C₆H₁₂O₆(aq) + 6O₂(g)

An example of an exothermic reaction is the mixture of sodium and chlorine to yield table salt. This reaction produces 411 kJ of energy for each mole of salt that is produced:

or

Exothermic reactions will burn you. Exothermic reactions give off heat, like fire. That heat has to leave the chemicals involved. So the temperature has to increase. This means energy leaves the system. Change in temperature is positive because the temperature increases (like on a graph)

Endothermic reactions need heat for them to start or to continue. So they will feel cold because they absorb heat from the surroundings. Change in temperature is negative because the temperature decreases

1. exothermic reaction:- reaction in which heat is released out along with the formation of product are called exothermic reaction.

for example:-burning of natural gas.

2. endothermic reaction:-reaction in which heat is taken along with the formation of products are called endothermic reactions.

for example:- glucose dissolve in water.

The reaction in which large amount of heat is evolved along with the products are called as exothermic reactions.

Respiration and decomposition of vegetable matter into compost are examples of exothermic process.

The reactions in which heat is absorbed is called as endothermic reaction.

Reactions in which heat is given out along with the products are called exothermic reactions.

For example: Burning of methane gas releases a large amount of energy. Hence it is an exothermic reaction.

CH₄ (g) + 2O₂ (g) → CO₂ (g) + 2H₂O (g)

Reactions that absorb energy or require energy in order to proceed are called endothermic reactions.

For example: When ammonium chloride is dissolved in water in a test tube, the test tube becomes cold. Thus the reaction is an example of endothermic reaction.

 Reactions in which heat is given out along with the products are called exothermic reactions.

For example: Burning of methane gas releases a large amount of energy. Hence it is anexothermic reaction.

CH₄ (g) + 2O₂ (g) → CO₂ (g) + 2H₂O (g)

Reactions that absorb energy or require energy in order to proceed are called endothermic reactions.

For example: When ammonium chloride is dissolved in water in a test tube, the test tube becomes cold. Thus the reaction is an example of endothermic reaction.

The reaction in which large amount of heat is evolved along with the products are called as exothermic reactions.

Respiration and decomposition of vegetable matter into compost are examples of exothermic process.

The reactions in which heat is absorbed is called as endothermic reaction.

• 1. exothermic reaction:- reaction in which heat is released out along with the formation of product are called exothermic reaction.

for example:-burning of natural gas.

• 2. endothermic reaction:-reaction in which heat is taken along with the formation of products are called endothermic reactions.

for example:- glucose dissolve in wate

EXOTHERMIC REACTION- IN THIS TYPE OF REACTIONS THE HEAT,ENERGY ARE OBTAINED OR EVOLVED IS KNOWN AS EXOTHERMIC REACTION .WE CAN SAY THIS ALSO EXO-meansTO LEAVE AND THERMIC-means HEAT ,ENERGY IN A CHEMICAL REACTION.

ENDOTHERMIC REACTION-IN THIS KIND OF REACTIONS THE HEAT ,ENERGY IS INVOLVED IN A REACTION TO FORM A PRODUCT . PLEASE NOTE -HEAT IS INVOLVED AT REACTANT SIDE.IS KNOWN AS ENDO THERMIC REACTION.THIS CAN ALSO BE DEFINE BY ENDO-means INVOLVE OR IN AND THERMIC -means HEAT ,ENERGY IN A CHEMICAL REACTION.