Endothermic rxns

[Aya Watson 2B]

Can someone please further explain how the temperature of a sample remains the same even though heat is being supplied in endothermic reactions?

[Arjan G 2H]

Hi! So, in an endothermic reaction, heat is needed for the bonds in a reaction to break and form new ones. This means that all of the heat that is absorbed in this chemical reaction is used solely for the purposed of breaking and forming new bonds in the products. If the temperature were to increase in a reaction, then that would mean the kinetic energy of the particles in the system must increase as well, but in phase changes, the kinetic energy remains the same. Therefore, all the heat is used to break bonds and change the state of matter a substance is in, so the temperature remains constant within the entire reaction. I hope this helps!

[Alex FreeWolf 2E]

Hi,

The heat being supplied is used solely to break and create intermolecular bonds during endothermic reactions and therefore the temperature of the sample remains constant throughout the reaction!

[Elena Chan 2L]

Hi there! As others have said, most of the energy put into endothermic reactions are used to break the bonds of the reactants. Any excess energy would be released as heat, but this is not the case for endothermic reactions. If you look at a graph that shows the delta H during an endothermic reaction, the total energy of the products is greater than the energy for reactants, making it non-spontaneous, so it needs to take energy from the surroundings in order for the reaction to occur. When it takes heat from the surroundings, it tends to leave the environment cooled down in order to absorb the heat and make the reaction happen. Hope that helps!

[Alan Nguyen 2I]

To reiterate the points of the earlier responses, the heat that is added to the reaction goes towards the bonds. The heat added serves as an energy source for breaking bonds, which means that the temperature of the sample does not change. If the energy went towards making the temperature rise, then there would be no phase change.

[Abby Citro 2A]

In an endothermic reaction, the heat added to the reaction goes towards the breaking of bonds within the system, so the energy is used in breaking the bonds instead of increasing the temperature.

[Reece Fong 2k]

The energy absorbed in endothermic reactions is used to break/form bonds, therefore being stored as potential energy and not affecting the temperature.

[405669838]

The temperature of the sample remains the same even though the heat is being supplied because the heat is being used to break the bonds.

[Neha Mukund]

The heat goes towards breaking and creating the bonds/intermolecular forces, therefore the temperature of the sample does not change.

[Madeline Ellmore 2C]

Hi Aya! In an endothermic reactions, heat is used to break and/or form new bonds. The heat that is absorbed in the reaction is used only to break and form these new bonds in the products. If the temperature in the reaction increases or decreases, that could/would lead to a phase change. Hope that helps!