Final answer:
At absolute zero, the particle speed distribution curve theoretically becomes a single point at zero since all molecular motion stops, as opposed to the broader Maxwell-Boltzmann distribution observed at higher temperatures.
Step-by-step explanation:
Theoretically, the distribution curve for particle speed of any gas at absolute zero would be a single point at zero speed. This theoretical state is due to the postulate that at absolute zero temperature (-273.15 °C), all molecular motion ceases. According to the Maxwell-Boltzmann distribution, which describes the speed distribution of particles in a gas, higher temperatures yield a broader range of speeds and a shifted curve towards higher speeds. However, at absolute zero, since there is no kinetic energy, every particle would be at rest, resulting in a delta function at zerom speed, with no breadth to the curve whatsoever.