Increasing concentration tends to

Increasing concentration tends to

• A. Increase the rate
• B. Decrease the rate
• C. No effect
• D. Change phase

Answer: (A)

Increasing the amount of a reactant in the same space increases how often particles collide. More collisions mean more chances for reactions to happen each second, so the rate of forming products goes up as long as temperature and any catalysts stay the same. It wouldn’t cause a phase change by itself, and it wouldn’t reduce the rate—except in theoretical cases where the reaction is zero-order with respect to that reactant, which is not the typical situation. So, the rate generally increases with concentration.

Increasing the amount of a reactant in the same space increases how often particles collide. More collisions mean more chances for reactions to happen each second, so the rate of forming products goes up as long as temperature and any catalysts stay the same. It wouldn’t cause a phase change by itself, and it wouldn’t reduce the rate—except in theoretical cases where the reaction is zero-order with respect to that reactant, which is not the typical situation. So, the rate generally increases with concentration.