Describe what happens to the particles in a solution during the process of evaporation.

In a solution, there are solute particles (the substance that is dissolved) and solvent particles (the substance in which the solute is dissolved).

When the solution is exposed to heat or when the surrounding temperature increases, the particles in the solution start to gain energy.

This energy makes the particles move faster. The particles of the solvent on the surface of the solution (usually water) start to vibrate more rapidly.

As the particles continue to gain more energy, the bonds holding them together start to break.

Eventually, the particles on the surface of the solution have enough energy to overcome the forces of attraction from the other particles in the solution.

These particles then escape from the surface of the solution and enter the air as gas. This process is known as evaporation.

The particles that have evaporated leave the solution, causing the concentration of the solute in the solution to increase.

This process continues until all the solvent has evaporated, leaving behind the solute particles.

It's important to note that evaporation is a surface phenomenon because it only involves the particles on the surface of the solution.

Also, evaporation leads to cooling because the particles that leave the solution carry away energy, reducing the overall energy (and therefore temperature) of the solution.