9. A substance dissolves in water by breaking up into smaller pieces. These pieces of the same substance spread throughout the water. This process is known as ____________________.
10. Stirring increases the rate of solution of a solid in a liquid because solute particles in solution are moved _____________ the surface of the solute.

Respuesta :

Hagrid
A substance dissolves in water by breaking up into smaller pieces. These pieces of the same substance spread throughout the water. This process is known as decomposition. 
Stirring increases the rate of solution of a solid in a liquid because solute particles in solution are moved from the surface of the solute.