Which event is an example of an endothermic reaction?.

For a reaction to be endothermic we have a process where heat is absorbed from a product and the end result is the product being colder than it originally was.

An event that can be a good practical example is using an ice pack on your arm. Your arm is warm before an ice pack is applied. After you apply an ice pack and leave it there for a while and then take it off, the site where the ice pack was would be colder than it was before the ice pack. Hope this helps!