endo/exothermic rxns

[Jennifer Lathrop 1F]

Is there a way to tell if a reaction is endo or exothermic by looking at the equation?

[josephperez_2C]

We can come to certain conclusions that are more obvious, such as H2 -> 2H being endothermic, because H2 has lower energy than the 2 H's. However, because we are given more complex chemical reactions, it's not always possible.

[katie_sutton1B]

Also, t the end of the equation it might give you delta H. If it is positive it is endothermic, while negative is exothermic.

[904936893]

The easiest way to tell if a reaction is endothermic or exothermic is by the change in enthalpy (delta H), which I believe will be given for these types of reactions.

[Jonny Schindler 1A]

Can you tell if a reaction is endo/exo just by the number of products vs. reactants?

[Esther Lee 4H]

^^ I was also wondering if this was a possible I feel like you can depending on the complexity of the equation but what else does it rely on?