Energy is_____ when Nitrogen combines with Oxygen to form NO.

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Solution

All chemical reactions need a certain amount of energy to get started. this energy is called activation energy.
Activation energy is used to break the bond between the reactant molecules.
Energy is absorbed to break the bond of reactant molecules and energy is released as bonds are made by the molecule of the products.
In some reactions the energy required to break the bond is larger than the energy released on making new bonds and the net result is the absorption of energy.. Such a reaction is called endothermic reaction.
Bond between nitrogen atoms in nitrogen molecule and oxygen atoms in oxygen molecule is very strong. So, heat energy is required for the reaction to occur.
N₂ (g) + O₂ (g) $\to$ 2NO(g) $-$ 44 kcal
The above reaction is an endothermic reaction.
Therefore, Energy is absorbed when nitrogen combines with oxygen to form NO.

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