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Reactant
Water is a reactant in photosythesis that is a liquid.
The concentration or activity of the product(s) will increase, and if there is at least one other reactant than the added one that is required for the completion of the reaction, the concentration of such an unadded reactant will decrease. (If there were no available unadded reactant, the reaction would not technically have been in equilibrium at the start, even though it may have reached a steady state that can persist for a long time in the absence of changed conditions.)
I believe it may be solar energy considering the start of the excited electrons journey in photosystem II (?)
The reactant is the substance present at the start of a chemical reaction, while the product is the substance(s) formed from a chemical reaction.
reactant
yes
Either an energy source to start the reaction or a catalyst.
The reactants
Reactants are what you start with, and products are what you end up with.
The Limiting Reactant is the reactant that runs out first in a reaction.
reactant
Sugar can be both a reactant and a product.
sulfur is a reactant
Reactant
reactant
The Limiting Reactant is the reactant that runs out first in a reaction.