Dissolving
How the Particle Model of Matter helps to explain dissolving:
The Particle Model of Matter says : The particles in a substance are attracted to one another. The strength of the attractive force depends on the type of particle. So particles that make a solution would have stronger attractions to each other, where as particles in mixtures would not have as strong of attractions to each other.
The Particle Model of Matter also says : That particles are always moving. Therefore it is easier for them to mix together and the attraction between particles can work quicker.