Question

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

Answer 1

Exothermic Reactions

The exothermic reaction is the opposite of an endothermic reaction. It releases energy by light or heat to its surrounding. A few examples are neutralization, burning a substance, reactions of fuels, deposition of dry ice, respiration, solution of sulfuric acid into water and much more.

Rusting iron, settling, chemical bonds, explosions, nuclear fission are a few examples.

Endothermic Reactions

The endothermic process is a term that describes a reaction where the system absorbs the energy from its surrounding in the form of heat. A few examples of the endothermic process are photosynthesis, evaporating liquids, melting ice, dry ice, alkanes cracking, thermal decomposition, ammonium chloride in water and much more.

Melting ice, evaporation, cooking, gas molecules, photosynthesis are a few examples.

Answer 2

$\large\text{\underline{\fbox{\colorbox{cyan}{Exothermic Reaction}}}}$

$\small\text{\color{blue}{\underline{An Exothermic reaction is a chemical}}} \\ \small\text{\color{blue}{\underline{reaction \: that \: involves \: the \: release \: of}}} \\ \small\text{\color{blue}{\underline{energy \: in \: the \: form \: of \: heat \: or \: light.}}} \\ \small\text{\color{blue}{\underline{These \: \: reactions \: are \: \: the \: opposite \: of}}} \\ \small\text{\color{blue}{\underline{endothermic \: reactions \: \: and \: \: \: can \: \: \: be}}} \\ \small\text{\color{blue}{\underline{expressed \: \: \: in \: \: \: a \: \: \: chemical \: \: equation}}} \\ \small\text{\color{blue}{\underline{as follows: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: }}} \\ \small\textbf{\color{blue}{\underline{Reactants → Products + Energy}}}$

$\small\text\blue{\underline{Exothermic reactions are reactions that}} \\ \small\text\blue{\underline{release \: energy \: into \: the environment in}} \\ \small\text\blue{\underline{the \: form of heat. \: Exothermic reactions}} \\ \small\text\blue{\underline{feel \: \: \: warm \: \: or \: \: \: hot \: \: or \: \: \: may \: \: even \: \: be}} \\ \small\text\blue{\underline{explosive. \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: }}$

$\large\text{\underline{\fbox{\colorbox{lime}{Endothermic Reaction}}}}$

$\small\text{\color{green}{\underline{Endothermic \: \: reactions \: \: \: are \: \: \: chemical}}} \\ \small\text{\color{green}{\underline{reactions \: in which the reactants absorb}}} \\ \small\text{\color{green}{\underline{heat \: energy \: from \: the \: surroundings \: to}}} \\ \small\text{\color{green}{\underline{form \: products. \: These \: \: reactions \: \: lower}}} \\ \small\text{\color{green}{\underline{the \: \: temperature \: of \: \: their \: surrounding}}} \\ \small\text{\color{green}{\underline{area, \: thereby \: creating \: a cooling effect.}}} \\ \small\text{\color{green}{\underline{Physical \: processes \: can be endothermic}}} \\ \small\text{\color{green}{\underline{as \: well – Ice \: cubes \: absorb \: heat energy}}} \\ \small\text{\color{green}{\underline{from \: \: \: \: \: \: \: \: \: \: their \: \: \: \: \: \: \: \: surroundings \: \: \: \: \: \: \: and}}} \\ \small\text{\color{green}{\underline{melt \: to \: form liquid water \color{lime}{(no chemical}}}} \\ \small\text{\color{green}{\underline{\color{lime}{bonds are broken or formed)}. \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: }}}$