Which if the following involves a reaction in which energy is absorbed?
Exothermic reactions are accompanied by an increase in temperature of the reaction mixture. Chemical reactions that absorb (or use) energy overall are called endothermic.
Is Sweating an endothermic reaction?
Sweating reduces skin temperature because the sweat that is secreted to the skin evaporates, which is an endothermic process. Thus, heat is absorbed from the body and skin to drive the evaporation of the sweat on the skin.
Are humans exothermic?
You probably know that humans are warm-blooded, while creatures like snakes are cold-blooded. Snakes are ectothermic which means they’re dependent on their environment for heat. Humans, on the other hand, are endothermic which means our body chemistry regulates our temperature and keeps it constant.
Which is exothermic in nature?
In thermodynamics, the term exothermic process (exo- : “outside”) describes a process or reaction that releases energy from the system to its surroundings, usually in the form of heat, but also in a form of light (e.g. a spark, flame, or flash), electricity (e.g. a battery), or sound (e.g. explosion heard when burning …
Why is solidification exothermic?
Solidification, also known as freezing, is a phase change of matter that results in the production of a solid. Generally, this occurs when the temperature of a liquid is lowered below its freezing point. Solidification is nearly always an exothermic process, meaning heat is released when a liquid changes into a solid.
Why is snow formation exothermic?
Snow is formed when temperatures drop low enough for water to change from a liquid to a solid, which is an exothermic process – as the surroundings cool, heat is transferred from liquid water into the surroundings, and the water solidifies into snow.
Is water an exothermic reaction?
We can all appreciate that water does not spontaneously boil at room temperature; instead we must heat it. Because we must add heat, boiling water is a process that chemists call endothermic. Clearly, if some processes require heat, others must give off heat when they take place. These are known as exothermic.