How would you identify the reactants and products in the chemical reaction below?
#6CO_2 + 6H_2O -> C_6H_12O_6 + 6O_2#
Of course, you have described the photosynthesis reaction, which is an endothermic reaction. From where does the energy come?
The reverse equation is clearly a combustion reaction. And this is an exothermic reaction, i.e. one that releases energy.
So whether you call the right hand side the products or the reactants depends on whether you are a green plant.