How does temperature affect reaction rate?

• A. Increasing temperature decreases reaction rate
• B. Temperature has no effect on reaction rate
• C. Increasing temperature increases reaction rate
• D. Temperature only affects solid reactants

Answer: (C)

Increasing temperature increases reaction rate due to the fact that temperature is a measure of the average kinetic energy of the particles involved in the reaction. As temperature rises, the kinetic energy of molecules increases, causing them to move faster and collide more frequently with one another. This increased frequency of collisions enhances the likelihood that the reactant molecules will encounter each other with sufficient energy to overcome the activation energy barrier necessary for a reaction to occur.

Moreover, higher temperatures can also cause a greater proportion of the reacting molecules to have energies that exceed this activation energy, facilitating more successful reactant interactions. This phenomenon generally leads to a higher rate of reaction for most chemical processes, particularly those that occur in the liquid or gaseous states.

On the other hand, while solid reactants are less affected by temperature changes in terms of collision frequency due to their fixed positions in a lattice, the prevailing principle is that temperature plays a crucial role in all phases of matter by affecting the kinetic energy and movement of molecules.