# Is photosynthesis a double replacement or single replacement reaction?

Sep 12, 2015

Photosynthesis is a single displacement reaction.

#### Explanation:

This is the formula for photosynthesis:

6$C {O}_{2}$ + 6${H}_{2} O$ $\to$ 6${O}_{2}$ + ${C}_{6} {H}_{12} {O}_{6}$

During the light reactions, the water molecules' hydrogen ions are separated from the oxygen atoms, which combine to form oxygen gas molecules which are released into the atmosphere as a waste product.

During the Calvin cycle, CO2 and hydrogen ions from the water combine to form glucose ${C}_{6} {H}_{12} {O}_{6}$.