What does one mean by exothermic and endothermic reactions? Give examples

Explanation

A chemical reaction is said to be exothermic in which a certain amount of heat energy is released. The container in which reaction in carried gets heated up. For example.
`N_(2)(g) + 3H_(2)(g) to 2NH_(3)(g) + 92 kj`
`CH_(4)(g) + 2O_(2)(g) to CO_(2)(g) + 2H_(2)O(l) + 890 kj`
`NaOH(aq) + HCl(aq) to NaCl(aq) + H_(2)O(aq) + 57.5 kj`
A chemical reaction is said to be endothermic in which a certain amount of heat energy is absorbed. The container in which reaction is carried becomes cold. For example.
`N_(2)(g) + O_(2)(g) to 2NO(g) - 180 kj`
`C(s) + H_(2)O(g) to CO(g) + H_(2)(g) - 130 kj`