Question

Is sublimation endothermic or exothermic?

Answer 1

1. Endothermic reaction: An endothermic reaction is a reaction that required energy or heat to finish. Example: The melting of ice is an example of an endothermic reaction.
2. Exothermic reaction: The reaction in which a particular amount of energy is released during product formation. Example: Combustion reaction of hydrocarbon.
3. Sublimation: The process in which a solid substance is directly converted into a gas phase, without a change in the temperature, is said to be sublimation. In order to affect the physical transformation from a solid to gas during sublimation, heat energy is typically given.
4. It is obvious that sublimation is an endothermic reaction based on the definition of the terms.
5. Example of sublimation: Dry ice is an example of sublimation. dry ice is solid ${\mathrm{CO}}_2$.

Hence, sublimation is an endothermic reaction.