Lactose + H₂O → Glucose + Galactose
Where:
* Lactose is the disaccharide sugar found in milk.
* Lactase is the enzyme that breaks down lactose.
* H₂O is water, which is required for the reaction.
* Glucose is a monosaccharide sugar.
* Galactose is another monosaccharide sugar.
Note: Lactase itself is not included in the chemical equation because it is an enzyme and does not get consumed in the reaction. It acts as a catalyst to speed up the breakdown of lactose.