Question

) Balance the equation K2Cr2O7 + HCl -> KCl + CrCl3 + H2O + Cl2 (ii) Differentiate between endothermic and exothermic reaction with example. Do a Paper ​

Answer 1

ii)

Difference between exothermic and endothermic reaction .

 Exothermic reaction :

1. Heat is given out during the reaction .

2.Heat liberated is indicated by a positive sign on the product side.

3. An exothermic reaction is represented

reactants→product+heat 

4.Energy of the reactant is greater than the product.

Endothermic reaction:

1. Heat is absorbed during the reaction ,

2.Heat observed is indicates by negative sign on the product side.

3. An endothermic reaction is represented

reactants→product−heat  

4. Energy of the reactant is lesser than the product.

Example:

Exothermic reaction: Rusting iron, settling, chemical bonds, explosions, nuclear fission

Endothermic reaction: Melting ice, evaporation, cooking, gas molecules, photosynthesis