Question

explain endothermic and exothermic reaction with 2 example each. (5)​

Answer 1

Here you go!
Chemical reactions where heat is absorbed by the substances are called endothermic reactions. Chemical reactions in which heat energy is released are called exothermic reactions.
Examples:
Endothermic: Evaporation of water, melting of ice...
Exothermic: Any combustion reaction, Igniting fireworks, reaction between water and calcium chloride...

I had my science exam a few days ago, so I have this learnt by heart. Hope this helps! If it does, let me know by giving me a thanks and marking my answer as the brainliest!

Answer 2

Exothermic reaction :

When energy is released in the form of heat during the reaction, it is called an exothermic reaction. The heat evolved is shown by a plus sign on the right-hand side of the equation.

For example :

$\sf N_{2} (g) + 3 H_{2} (g) \longrightarrow 2NH_{3} (g) + 92 kJ$

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Endothermic reaction :

When energy is absorbed as heat during a reaction it is called an endothermic reaction the heat absorbed is shown by a plus sign on the left hand side of the equation or with the negative side on right hand side.

For example :

$\sf N_{2} (g) + O_{2} (g) + 180 kJ \longrightarrow 2NO (g)$

⠀ ⠀⠀ ⠀ ⠀⠀ OR

$\sf N_{2} (g) + O_{2} (g) \longrightarrow 2NO (g) - 180 kJ$