Question

ii. What does mean by exothermic and endothermic reactions? Give
examples.
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Answer 1

Answer: Exothermic Reaction: A chemical reaction in which heat is given out is known as exothermic reaction.

Carbon + Oxygen gives  Carbon Dioxide + Q

Endothermic Reaction: A chemical reaction in which heat energy is absorbed is known as endothermic reaction.

 Nitrogen + Oxygen gives 2 nitrous oxide (2NO)  -  Q

Answer 2

Answer:

Explanation:

Exothermic Reaction: A chemical reaction in which heat is given out is known as exothermic reaction. For example

CH4 + 2O2 —> CO2 + 2H2O + Heat

2Al + Fe2O3 —> 2Fe + Al2O3 + Heat

Endothermic Reaction: A chemical reaction in which heat energy is absorbed is known as endothermic reaction. For example

2NH3 → N2 + 3H2; ΔH = +91.8 kJ mol-1