Movement of particles from high concentration to low concentration.
Average speed of gas particles is 400 m/s.
Example of difussion experiment is: Chromotography.
Differnt colours are attracted to different depths of water so in a chromorography experiment the more soluble colours go straight ot the top e.g yellow.
Atoms & Molecules
Molecule - 2 or more atoms CHEMICALLY joined.
Atom - A single atom
Mixture - Different molecules or atoms together but NOT chemically joined.
Elements - Have the same type of atoms.
eg. CA - could have CA + CA+CA still an element