IB Chemistry SL Practice Exam 2025 – Complete Prep Resource

Increasing temperature generally increases the reaction rate due to several key factors related to the kinetic energy of the molecules involved in the reaction. As temperature rises, the kinetic energy of the molecules increases, leading to faster movement. This means that the molecules collide more frequently and with greater energy.

Higher collision frequency increases the likelihood that reactant particles will interact effectively. According to collision theory, reactions occur when particles collide with sufficient energy and the correct orientation. As the temperature rises, not only do the number of collisions increase, but a greater proportion of these collisions will have the necessary energy to overcome the activation energy barrier for the reaction, thus forming products more rapidly.

Additionally, many reactions involve breaking and forming bonds, processes that require adequate energy to occur. The increased energy present at higher temperatures allows more reactant molecules to achieve these energy thresholds, further facilitating faster reaction rates.

Overall, the relationship between temperature and reaction rates is a fundamental concept in chemistry, often illustrated by the Arrhenius equation, which expresses how reaction rates increase with temperature, reinforcing the idea that raising the temperature typically speeds up chemical reactions.