Particles that spread throughout a clear liquid are called solute particles.

Here's why:

* Solution: A solution is a homogeneous mixture where one substance (the solute) is dissolved evenly into another substance (the solvent).

* Solute: The substance that dissolves is called the solute.

* Solvent: The substance that does the dissolving is called the solvent.

For example, in salt water, salt is the solute, and water is the solvent. The salt particles are spread evenly throughout the water, making it a clear solution.