Are these endo or exogonic reactions?

Question

Silver Tarnishing and photosynthesis,

thanks

I mean ender and exergonic.

Oh and rust, not silver tarnishing.

I'm so bad at science.

Answer 1

Nobody answered your question. =(
Most likely because of the minor spelling mistake.

I'll assume that you are asking endergonic and exergonic rxn question.

ENDERGONIC means that energy is required to make the rxn occur.
EXERGONIC means that energy is released as the rxn occurs.

Therefore:

SILVER TARNISHING IS AN EXERGONIC RXN:
Silver tarnishing is a spontaneous process. Ag + O2 ---> Ag2O.
This means that silver oxide (tarnished silver) is more stable or energetically favorable than its reactants. Thus when something more stable is formed, Energy is Released.

PHOTOSYNTHESIS IS ENDERGONIC RXN:
Photosynthesis requires energy; and glucose- the product- has more energy than its reactants. In Biology, this process is called anabolic process because it builds big molecule, glucose, from small molecules, CO2 and H2O.