* Diffusion and Molecular Motion: Diffusion is the process where molecules spread out from areas of high concentration to areas of low concentration. This process is driven by the random motion of molecules.
* States of Matter and Molecular Motion: Gases have the highest degree of molecular motion and are far apart from each other. Liquids have a moderate degree of molecular motion and molecules are closer together. Solids have the lowest degree of molecular motion and their molecules are tightly packed.
* Implications for Diffusion: Because gaseous bromine molecules are moving much faster and are more spread out, they will diffuse much quicker through another gas (or even a liquid) than liquid bromine molecules.
Think of it this way: Imagine trying to move through a crowded room versus moving through an empty field. The molecules in a gas are like people in an empty field, able to move freely. The molecules in a liquid are more like people in a crowded room, bumping into each other and moving slower.
