Question

question 5 (1 point)
which quantity does not increase when the temperature of a reaction system is raised?
activation energy
number of collisions
number of effective collisions
average kinetic energy of the particles
all of the above increase

Explanation:

Activation energy is a property of the reaction itself, determined by the nature of reactant molecules and the reaction pathway. It does not depend on temperature. When temperature is raised:

• Particles move faster, so the number of collisions increases.
• More particles have energy ≥ activation energy, so the number of effective collisions increases.
• Average kinetic energy of particles ($KE=\frac{3}{2}kT$, where $k$ is Boltzmann's constant and $T$ is temperature) increases as $T$ increases.

Answer:

activation energy