Look at the diagram of a fuel cell below. A fuel cell with 2 vertical objects labeled A and B connected by an electrical wire, an area between them, and substances flowing to, along, and away from the vertical objects and to the left and right.

Which parts of the fuel cell do A and B represent?

air
anode and cathode
electrolyte
hydrogen and nitrogen

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.