Question

why does increasing the speed of molecules increase reaction rate? molecules move more erratically, increasing only the energy of collisions. molecules move faster, increasing only the chance of collisions. molecules move faster, increasing both the chance and energy of collisions. molecules move more erratically, increasing the concentration of reactants.

Explanation:

Increasing molecular speed means molecules cover more distance in a given time, increasing the frequency of collisions (chance of collisions). Also, faster - moving molecules have higher kinetic energy, thus increasing the energy of collisions. For a chemical reaction to occur, reactant molecules must collide with sufficient energy.

Answer:

C. Molecules move faster, increasing both the chance and energy of collisions.