What do you undestand by exothermic reaction and endothermic reaction? Give one example of each type.

Answer

A

Explanation

Exothermic reactions: Reactions which are accompoanied by evolution of heat are called exothermic rections. The quantity of heat produced is shown either along with the products with a `+` sign or in terms if `DeltaH` with a `-` sign. E.g.,
`C(s) + O_(2)(g) to CO_(2)(g) + 393.5` kJ
`H_(2)(g) + 1/2O_(2)(g) to H_(2)O(l)`, `DeltaH=-285.8 kJ mol^(-1)`
Endothermic reactions: Reactions which proceed with absorption of heat are called endothermic reactions. The quantity of heat absorbed is shown either along with the products with a `-` sign or in terms of `DeltaH` with a `-` sign e.g.
`C(s) + H_(2)O(g) to CO(g) + H_(2)(g) -131.4 kJ`
`N_(2)(g) + 3H_(2)(g) to 2NH_(3)(g), DeltaH=+92.4 kJ mol^(-1)`