# What is the chemical process that produces oxygen gas?

Jan 4, 2018

Do you mean $\text{photosynthesis....?}$
$\text{Photosynthesis}$ produces simple sugars, and as a bonus, dioxygen, from carbon dioxide, and water, in the presence of sunlight....and we can represent this reaction by the equation....
$6 C {O}_{2} \left(g\right) + 6 {H}_{2} O \left(l\right) \stackrel{h \nu}{\rightarrow} {C}_{6} {H}_{12} {O}_{6} \left(a q\right) + 6 {O}_{2} \left(g\right)$
Because we BREAK strong $C = O$ and $H - O$ bonds, substantial energy input must be made to the reaction, and this is supplied by solar energy... And so can you tell us why photosynthesis does not occur at night-time....?