A solid reactant is placed into a beaker of a warm water. The liquid vigorously bubbles as the solid dissolves into the solution. What will most likely happen if the temperature of the liquid is slightly reduced?

Lowering the liquid’s temperature slightly reduces the average kinetic energy of the reacting particles. They move more slowly and have fewer effective collisions per second, so the reaction usually proceeds more slowly and produces fewer bubbles over the same amount of time. The correct choice is B, fewer bubbles because of fewer collisions of reactant molecules.

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