What is the random mixing of gas molecules called?

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

Agas is contained in a thick walled balloon when the pressure changes from 1.21 atm to 2.52 the volume changes from 3.75 l to 1.72 l and the temperature change from 293k to blank k

Arollercoaster car at the top of a hill has potential energy kinetic energy chemical energy light energy