ATP exergonic or endergonic?

[DoctaWalnuts]

Why is this reaction ATP + H2O --> ADP + Pi exergonic?

If you are inputting ATP, you are inputting energy. Inputting energy=endergonic?

Endergonic means absorbing energy in the form of work. Endergonic reactions are not spontaneous.

So will it always be backwards? If it's spontaneous ATP + H2O..then it's endergonic. If it's non-spontaneous (requires heat) then it's exergonic?

That seems soo backwards!

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[uncbestyet]

The energy is stored in the phosphate bonds. The bond is broken during the reaction. Energy is released on the products side of the equation.

ATP+H2O--> ADP+P+energy (exergonic - energy released)

ADP+P+energy-->ATP (endergonic-energy input)