Question

which particle model represents sugar dissolving in water?

Explanation:

Step1: Analyze the first model

The first model has oxygen gas and water. But the question is about sugar dissolving in water, so this model is not relevant.

Step2: Analyze the second model

The second model has carbon - dioxide gas, water and sugar. But when sugar dissolves in water, there is no carbon - dioxide gas involved in the dissolution process itself (assuming a normal dissolution without any chemical reaction producing carbon - dioxide).

Step3: Analyze the third model

The third model has only water and sugar particles. When sugar dissolves in water, the sugar particles disperse among the water particles. This model represents the dissolution of sugar in water as it shows sugar (blue) particles getting mixed with water (red) particles.

Answer:

The third particle model.