The gas particles in a vessel at \(20^\circ \pu{C}\) are represented in the diagram above. The lengths of the arrows represent the speeds of the particles. Which of the following diagrams best represents the particles when the vessel is heated to \(100^\circ \pu{C}\)?

The average speed of gas particles increases as the temperature increases. This doesn't necessarily mean that all of the particles will obtain greater speed. It is only necessary that the average speed is greater.

The number of molecules do not change as temperature increases.