Is a thermos endothermic or exothermic?

Answer 1

Endothermic: absorbs energy from surroundings in the form of heat. ie. outside temperature loses heat.

Exothermic: releases energy into surroundings in the form of heat ie. outside temperature gains heat.

Seeing as a thermos is supposed to MAINTAIN the temperature of its contents, it is neither.

Answer 2

"Hot" is a relative term used to describe that something has more thermal energy than an arbitrary point. Exothermic and endothermic are terms that describe whether a chemical reaction releases or absorbs energy into/from the environment. The two ideas are not comparable.

Answer 3

This will seem counter-intuitive. Condensation, deposition, and freezing (processes where temperature is decreasing) are exothermic processes. That is, they must give energy to the environment in order to become colder. Processes with a negative change in heat are considered exothermic.

Conversely, boiling, evaporation, and sublimation are endothermic processes. The environment must give heat to the substance in order for the phase change to occur. A positive change in heat indicates an endothermic process.

Answer 4

Boiling is an exothermic reaction as the heat is released during the reaction.

Answer 5

Heat has to be supplied for a substance to boil. So that is an endothermic reaction.

Answer 6

Exothermic of course, releases heat.

Answer 7

The thermite reaction is highly exothermic.

Answer 8

A solid is itself neither endothermic or exothermic. However the phase change from liquid to solid will likely be exothermic.

Answer 9

It would be Endothermic because the oven is transferring heat to the food just like how the sun heats an ice cube.