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Answer

Because it increases the surface area of the solute.

Explanation

The rate at which a solid dissolves in a liquid is influenced by several factors. One of these factors is the surface area of the solid that is exposed to the liquid. When a solid is broken into smaller pieces, the total surface area of the solid that is available for interaction with the liquid solvent increases. This increased surface area allows for more solvent-solute interactions to occur at any given time, which in turn increases the rate at which the solid dissolves. The other options provided do not directly relate to the effect of breaking a solid into smaller pieces on the dissolution rate. Increasing the pressure above the solution or the energy of the solution, or increasing the temperature of the solution, may affect the dissolution rate, but these changes are not a direct result of breaking the solid into smaller pieces. Therefore, the correct answer is that breaking a solid into smaller pieces increases the rate of dissolving because it increases the surface area of the solute.

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