Humber Admissions Practice Test

What is the main result of increasing concentration in a solution?

1. Increased reaction energy

2. Decreased reaction rate

3. Increased likelihood of collisions

4. No effect on the reaction

The correct answer is: Increased likelihood of collisions

Increasing the concentration of a solution primarily leads to an increased likelihood of collisions between reacting particles. When you raise the concentration, there are more particles of the reactants in a given volume, which enhances the probability that these particles will collide with each other. Since chemical reactions occur when reactant molecules collide effectively, a higher concentration means a greater number of collisions per unit time. This subsequently can lead to an increased reaction rate, as more frequent collisions often result in more successful reactions occurring. In many cases, this principle is crucial in understanding how reaction conditions can be manipulated to achieve faster or more efficient chemical processes. The other options do not accurately describe the consequences of increased concentration; while reaction energy and rate might vary depending on specific conditions, the clear and direct outcome of increased concentration is indeed the increased likelihood of collisions among reactants. Therefore, the choice highlighting this relationship aligns with fundamental concepts in chemistry.