How does increasing concentration affect collisions according to the particle model?

How does increasing concentration affect collisions according to the particle model?

• A. Fewer particles in a given space.
• B. Concentration decreases.
• C. More particles in a given space and more frequent collisions.
• D. Concentration changes the color of the solution.

Answer: (C)

Increasing concentration means more particles in the same space. In the particle model, these particles are constantly moving and colliding with one another. With more particles per volume, there are more possible collisions, so the collision frequency goes up. This higher collision frequency is why reactions tend to occur faster when concentration is increased. Color changes aren’t the direct result of collision frequency; they depend on how light interacts with dissolved particles, not on how often particles collide.

Increasing concentration means more particles in the same space. In the particle model, these particles are constantly moving and colliding with one another. With more particles per volume, there are more possible collisions, so the collision frequency goes up. This higher collision frequency is why reactions tend to occur faster when concentration is increased. Color changes aren’t the direct result of collision frequency; they depend on how light interacts with dissolved particles, not on how often particles collide.