| Solid | Has a definite shape and definite volume, particles in a fixed position |
| Liquid | Has an indefinite shape and definite volume, particles slide past one another |
| Gas | Has an indefinite shape and an indefinite volume, particles spread apart |
| 3 States of Matter | Solid, Liquid, and Gas |
| Mixtures | Two or more substances that are mixed together, but not chemically combined |
| Solutions | Best Mixture |
| Pure Substance | Only one kind of matter |
| Atom | The smallest particle of an element with the properties of that element |
| Element | A substance in which all atoms are alike, which cannot be chemically or physically separated |
| Compounds | Made of two or more elements that are chemically combined |
| Chemical Bond | The force that holds atoms together |
| Physical Change | A change that alters the form or appearance of a substance, but does not make the materials in to another substance |
| Chemical Change | A change that creates a new substance |
| Melting | Change from solid to liquid, heat/energy added |
| Boiling | Vaporization that occurs on and below the surface of a liquid, heat/energy added |
| Vaporization | Liquid to gas, heat/energy added |
| Sublimation | Change from Solid to Gas, heat/energy added |
| Freezing | Change from liquid to solid, heat/energy taken away |
| Condensation | Change from gas to liquid, heat/energy taken away |
| Characteristic Properties | A quality of a substance that never changes and can be used to identify the substance |
| Chemical Formula | A combination of symbols that represent the elements in a compound |
| 5 Signs of a Chemical Reaction | Change of color, change in temperature, precipitation, production of gas, change in properties (odor, light) |
| Crystalline Solid | A substance made of crystals in which the particles are arranged in regular repeating patterns |
| Amorphous Solid | A solid made up of particles that are not arranged in a regular pattern |
| Viscosity | The resistance of a liquid to flowing |
| Temperature | The measure of the average energy of the motion of particles in a substance |
| Pressure | Force exerted on a surface, divided by the total area over which the force is exerted. |
| Evaporation | Vaporization that occurs at the surface of a liquid |
| Molecule | Particle consisting of two or more atoms |
| Atoms | Building blocks of all matter, smallest particle of an element that still retains properties of that element |
| Parts of an Atom | Protons, Neutrons, Electrons |
| Protons | Particles with a positive charge |
| Neutrons | Particles with no charge |
| Electrons | Particles with a negative charge |