Enthalpy signs

[Nicole Garrido 2I]

When is the change in H, Enthalpy, positive and when is it negative?

[Searra Harding 4I]

Enthalpy will be positive when the reaction is endothermic meaning it absorbs heat. It is negative when the reaction is exothermic meaning giving off heat.

[Anjali_Kumar1F]

What is state property and what does it mean when enthalpy is state property.

[Rami_Z_AbuQubo_2K]

When deltaH is positive, that mean that the reaction is going to absorb heat in order to proceed and is endothermic. When deltaH is negative, that means that the reaction is going to release heat into the environment and is exothermic.

[davidryan3f]

Delta H is positive when the reaction is endothermic and Delta H is negative when the reaction is exothermic.

[KarlaArevalo2F]

enthalpy is positive for endothermic because there is the need for heat, while enthalpy is negative for exothermic because heat is being released (exo=exit)

[KarlaArevalo2F]

enthalpy is positive for endothermic because there is the need for heat, while enthalpy is negative for exothermic because heat is being released (exo=exit/out)

[Diana Sandoval 1K]

If it's positive it's endothermic and if it's negative it's exothermic.

[Anand Narayan 1G]

When Delta H is positive, it's endothermic and when it's negative, it's exothermic

[deepto_mizan1H]

Another aspect of this is thinking of the heat as a product or reactant, where in an endothermic reaction (+) it would require heat which can be considered as a reactant. In an exothermic reaction (-), where heat is given off, we can think of it as a product.

[Jordan Lo 2A]

Another aspect of this is thinking of the heat as a product or reactant, where in an endothermic reaction (+) it would require heat which can be considered as a reactant. In an exothermic reaction (-), where heat is given off, we can think of it as a product.

This strategy is also helpful when thinking about le chatelier's principle and heat added/taken away to the system

[Tinisha 1G]

Enthalpy is the amount of heat absorbed in a reaction. If the reaction is endothermic, it absorbs heat, so the sign of enthalpy is therefore postitive. It is negative if the reaction is exothermic, and so it is releasing heat, therefore is going to have a negative enthalpy.

[Jason Ye 2I]

Its positive when the reaction is endothermic and negative when it is exothermic

[George Ghaly 2L]

The enthalpy change is positive when a reaction gains heat (endothermic reaction) and is negative when the reactants release energy to the universe (exothermic reactions)