Final answer:
The rate of reaction increases when the solid is broken into smaller pieces, which increases surface area, and when the temperature of the liquid is increased, which raises collision frequency and energy.
Step-by-step explanation:
The rate of reaction between a solid and a liquid can be altered by changing the size of the pieces of the solid and by changing the temperature of the liquid. When the solid is broken into smaller pieces, the surface area increases, leading to more frequent collisions between the reactant particles. This is because more particles are exposed and available to collide with particles in the liquid, speeding up the reaction.
As for temperature, increasing the temperature of the liquid increases the collision frequency of the molecules, which naturally increases the reaction rate. Warmer temperatures impart more energy to the particles, which means they move faster and collide more often with greater energy. This also increases the likelihood that the collisions will have enough energy to overcome the activation energy barrier, thus leading to a faster reaction rate.