0 taking place or being formed by absorbing heat: --
Is the overall reaction exothermic or endothermic?
Melting, evaporation and boiling are endothermic processes.
In an endothermic reaction, the temperature of the surroundings decreases.
Bond breaking is endothermic and bond forming is exothermic.
The decomposition of hydrogen iodide is an endothermic reaction.
This gives a mixture of carbon monoxide and hydrogen in an endothermic reaction.
Chemical reactions which absorb energy from the surroundings are described as endothermic.