The diagram illustrates a Boltzmann distribution for the energies of gaseous molecules together with the activation energies, $E_a$, for a reaction both in the absence of a catalyst and in the presence of a catalyst. Which statement about this distribution curve is correct?
- AIf the temperature of the gas is increased, the maximum of the curve becomes higher.
- BIf the temperature of the gas is increased, the maximum of the curve moves to the left.
- CThe fraction of molecules that react in the presence of a catalyst is shown by the shaded region.
- DThe fraction of molecules that react in the absence of a catalyst is shown by the shaded region.