Endothermic v. Exothermic

[AlbertGu_2C]

Endothermic and exothermic reactions are always positive and negative delta Hs, respectively. That is because endo/exothermic reactions are basically defined using this metric

[Susan Chamling 1F]

Yes, I believe that positive delta H values always indicate endothermic reactions, while negative delta H values always indicate exothermic reactions.

[Sara Sandri 2B]

Yes, exothermic reactions will have a negative delta H, indicating the release of heat while endothermic reactions will have a positive delta H, indicating the absorption of heat. It's important to keep in mind that gibs free energy depends on both the delta H, delta S, and temperature so the delta H of a reaction does not tell us anything about its delta G.

[Victor Qiu 1C]

ΔH<0, exothermic, releases heat;
ΔH>0, endothermic, absorbs heat;
ΔG<0, exergonic, spontaneous;
ΔG>0, endergonic, not spontaneous.

[David Y]

Positive delta H represents endothermic while negative delta H represents exothermic.

[Rose_Malki_3G]

Yes an endothermic reaction always has a positive delta H value and exothermic reaction always has a negative delta H value.

[Muskaan Abdul-Sattar]

Yes, it is true. Exothermic reactions will always have a negative delta H and endothermic reactions will always have a positive delta H. This is how you can distinguish between the two!

[Kylie Joe 2A]

I think that's the right way to think about it! Delta H being positive or negative is the main constant indicator of a reaction being endothermic or exothermic

[205282258]

Yes, for endothermic reactions delta H will always be positive because heat will be absorbed and for exothermic reactions delta H will always be negative because heat will be lost.

[Kaitlyn_Urquilla_1I]

Generally, endothermic reactions will have a positive delta H whereas exothermic reactions will have a negative delta H.

[Katherine Li 1A]

Yes, endothermic reactions will always have a positive delta H while exothermic reactions have a negative delta H. There won't be exceptions to this rule, because delta H is meant to directly indicate when a reaction is exo-/endothermic.

[Zoe Dhalla 3I]

So, for a process carried out at constant pressure, if the heat added to the system is positive (endothermic), ΔH is positive and if the heat added to the system is negative (exothermic, heat removed from system), ΔH is negative.

[Zoe Dhalla 3I]

So, for a process carried out at constant pressure, if the heat added to the system is positive (endothermic), ΔH is positive and if the heat added to the system is negative (exothermic, heat removed from system), ΔH is negative.

[amreen_sandhu1k]

correct! Endothermic reactions will always have a positive delta H, and exothermic reactions will always have a negative delta H.

[Zoe Dhalla 3I]

So, for a process carried out at constant pressure, if the heat added to the system is positive (endothermic), ΔH is positive and if the heat added to the system is negative (exothermic, heat removed from system), ΔH is negative.

[Martha Avila 1I]

Hello. An endothermic reaction will always have a positive delta H because heat is required. If you have a negative delta H then you know that heat is being released and you have an exothermic reaction. These values are set in stone and never change conceptually. Hope this helps.

[Michelle Argueta 1E]

Endothermic reactions will always have a positive delta H since heat is required. Exothermic reactions will always have a negative delta H and you know that heat is being released and you have an exothermic reaction.

[Do Yeun Park]

Hi!
Yes! Endothermic will have a positive enthalpy, and exothermic will have a negative enthalpy.

[Jordyn Lee 1J]

Hi, yes endothermic reactions will always have a positive delta H and exothermic reactions will have a negative delta H. This is because heat is required and heat is released, respectively.

[Jessica Cornelia Hongarta 1G]

Hi! Yes, exothermic reactions will always have a negative ΔH value because overall, the reaction releases heat (enthalpy of reactants is greater than enthalpy of products), so the enthalpy change is negative (ΔH = H products - H reactants). Meanwhile, endothermic reactions will always have a positive ΔH value because overall, the reaction takes up heat (enthalpy of products is greater than enthalpy of reactants), so the enthalpy change is positive.

[Audrey Banzali-Marks 1A]

By definition, endothermic reactions will have a positive delta H because products have to have more energy than reactants to be classified as endothermic. The opposite is true for exothermic (negative delta H, reactants have more energy than products).

[Lindsey Walter 3E]

Yes, the definition of endothermic and exothermic are related to their delta H values, so you will not find exceptions. Endothermic will always have a positive delta H and exothermic will always have a negative delta H.

[Amy Jordan 2A]

Hi, ΔH for an exothermic reaction will always be negative since energy is released. ∆H for an endothermic reaction will always be positive since energy is absorbed. Hope this helps!

[Madison Rhynhart 3H]

Yes this is true because a negative delta H would indicate a release of energy (exothermic) whereas a positive delta H would indicate taking in energy or an endothermic reaction.

[taline krumian 1L]

Yes. If a system is absorbing heat (endothermic), delta H will be positive. If a system is releasing heat (exothermic), delta H will be negative.

[Samantha Quevedo 2L]

As far as I know, if you have a delta H that is positive then you have an endothermic reaction. If the delta H is negative then you have an exothermic reaction.

[Jonathan Liu 2I]

Yes, exothermic means that the change in enthalpy is negative and endothermic means that the change in enthalpy is positive.

[Gianna Sciole 2F]

yes, they will always have a positive delta H because they are endothermic reactions. likewise, the opposite direction of the phase changes will be exothermic and have a negative delta H, such as going from gas to liquid (condensation) and going from liquid to solid (freezing).

[Nicole Weinstein 3E]

Yes, endothermic reactions will always have a positive delta H value because heat is required and exothermic reactions will have negative delta H values because heat is released from the system.

[jaycmartinezDisc3b]

Yes, endothermic reactions will always have a positive delta h and the exothermic reactions will have a negative delta h. To my understanding, delta h represents the internal change of energy in a system (going in or out). So, you can remember this by thinking the negative value is energy leaving the system, and positive value represents energy going into the system.

[205484435]

yes, exothermic will always be negative because they are releasing heat and endothermic will always be positive because it needs heat

[405509920]

I'm pretty sure that endo is always (-) and exo is always (+). However, I dont know if its possible to have 0 dH value.

[Collin Le 3I]

Yes, endothermic reactions will always have a positive delta H and exothermic rxns have negative delta H.

[Sabira Mohammed 3I]

Yes, exothermic reactions always have a negative change in H because H of reactants is higher than that of the products and endothermic reactions have a positive change in H because H of the reactants is lower than that of the products.

[Caitlyn Lo 2F]

Exothermic means the reaction is giving off heat so delta h is negative and endothermic means the reaction requires heat so delta h is positive

[Rebecca Preusch 2C]

Yes endothermic has a positive delta H and exothermic has a negative delta H.

[rachelsjordan 1K]

Yes I think you can just assume that

[Charlie Sjogren-Black]

Yes, endothermic reactions always have positive delta H, while exothermic reactions always have a negative delta H.

[Julie Mai 1K]

Yes, exothermic reactions will always have a negative delta H value while endothermic reactions will always have a positive delta H value

[Alex Luong 3H]

Endothermic reactions require heat, and enthalpy is in regards to the system, so a positive enthalpy value means that the system gains energy (heat).