Question

pure maple syrup has a high sugar content. its composition is 70% sucrose (\\(\text{c}_{12}\text{h}_{22}\text{o}_{11}\\)). if you heat maple syrup what will happen to its viscosity?

• it will increase.
• it will separate the sugar from the other ingredients.
• it will decrease.
• it will have no effect.

Explanation:

Define viscosity and temperature relationship

Using the Properties of Fluids knowledge point

$$ \eta \propto e^{\frac{E_a}{RT}} $$

As temperature increases, the kinetic energy of the molecules overcomes intermolecular attractions, which decreases the fluid's resistance to flow.

Apply to heating maple syrup

Using the Properties of Fluids knowledge point
Heating the syrup increases molecular motion and reduces intermolecular forces.
Therefore, the viscosity of the maple syrup will decrease.

Answer:

• It will increase.
• It will separate the sugar from the other ingredients.
• It will decrease. (Correct answer)
• It will have no effect