If we increase the concentration of a reactant, what happens to the collisions between particles?

A. There are more collisions.
B. There are fewer collisions.
C. There are the same number of collisions, but they have less energy.
D. There are the same number of collisions, but they have more energy.



Answer :

When we increase the concentration of a reactant in a chemical reaction, we are essentially adding more particles of the reactant into the system.

Here is a detailed step-by-step explanation:

1. Understanding Collision Theory: According to the Collision Theory of chemical reactions, for a reaction to occur, the reacting particles must collide with sufficient energy and proper orientation. This energy is known as the activation energy.

2. Effect of Concentration on Collisions: When we increase the concentration of a reactant, the number of particles per unit volume increases.

3. Frequency of Collisions: As a result of the increased number of particles, the likelihood of reactant particles colliding with each other also increases.

4. Conclusion: Therefore, increasing the concentration of a reactant leads to an increase in the frequency of collisions between the reactant particles.

Based on this understanding:

Correct Option:
A) There are more collisions.

This matches our true answer, where an increase in concentration results in more collisions between particles.