What do you understand by exothermic reaction and endothermic reaction? Give one example of each type .
std 11 chemistry
Answers
Answer:
Exothermic reactions are those reactions in which heat is released.
Reactants→products+heat
For example, formation of ammonia from nitrogenand hydrogen is an exothermic reaction.
N2(g)+3H2(g)→2NH3(g)+92.2kJ
Endothermic reactions are those reactions in which heat is absorbed.
Reactants+heat→products
For example, dissociation of ammonia into nitrogenand hydrogen is an endothermic reaction.
2NH3(g)+92.2kJ→
N2(g)+3H2(g)
Answer:
Exothermic reaction:
An exothermic reaction is a chemical reaction that produces heat(has a negative ΔH). In other words, the activation energy needed to initiate the reaction is less than the energy it releases.
Eg: Neutralization reactions, the Haber process, the thermite reaction, and combustion reactions.
Endothermic reaction:
An endothermic reaction is any chemical reaction that absorbs heat from its environment. The absorbed energy provides the activation energy for the reaction to occur. A hallmark of this type of reaction is that it feels cold.
Eg: Ozone production, obtaining H₂S, dissolving a salt
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