When two molecules of glucose are joined together by a dehydration reaction, the products are:

* Maltose (a disaccharide)

* Water (H₂O)

Here's why:

* Dehydration Reaction: This reaction removes a water molecule (H₂O) from the reacting molecules.

* Glucose: The chemical formula for glucose is C₆H₁₂O₆.

* Maltose Formation: When two glucose molecules combine, one loses a hydrogen atom (H) and the other loses a hydroxyl group (OH), forming water. The remaining parts of the glucose molecules then join together, forming maltose (C₁₂H₂₂O₁₁).

The overall reaction can be represented as:

C₆H₁₂O₆ + C₆H₁₂O₆ → C₁₂H₂₂O₁₁ + H₂O

(Glucose) + (Glucose) → (Maltose) + (Water)