Changing the concentration of reactant molecules can influence the rate of a chemical reaction.
Increasing Concentration
Effect: More particles are present in the same volume, leading to an increase in the number of collisions.
Analogy: Similar to having more small children running around in a room, leading to more collisions between them.
Collision Theory
Collision Frequency: More reactant particles result in more collisions per second.
Successful Collisions:
If temperature remains constant, the average kinetic energy of particles remains unchanged.
The proportion of successful collisions remains constant, but the overall number of successful collisions increases due to the higher frequency of total collisions.
Summary
Increasing the concentration of reactants while maintaining the same temperature increases the rate of reaction by increasing the number of collisions and thus the frequency of successful collisions.