| Term | Definition |
|---|
| Matter | Substance of the physical world; Anything that occupies space and has inertia |
| Mass | Amount of space an object occupies |
| Atom | Smallest part of an element that retains the chemical properties of that element |
| Compound | A substance composed of more than one atom. |
| Element | Substance composed completly out of one atom |
| Molecule | the simplest structural unit of an element or compound; A molecule is a group of atoms linked together |
| Brownian motion | The random motion of microscopic particles caused by molecular collisions |
| Diffusion | Process in which molecules are mixed through another molecule by random molecular motion |
| Osmosis | A one-way diffusion through a semipermeable membrane |
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