The Maxwell-Boltzmann distribution curve show the distribution of energy of the particles. The area under the graph represents the total number of particles.No particles have zero energy.Most particles have intermediate energies.A few particles have high energies that exceed the activation energy and can react.There is no upper limit to the curve.At higher temperatures the peak of the curve is lower and moved to the right. The number of particles with enough energy to react (energy greater than the activation energy) increases.