| Term | Definition |
| physical property | characteristic that can be observed or measured ; e.g. color, state, or hardness |
| solubility | ability of a substance to dissolve |
| density | relationship between mass and volume |
| electrical conductivity | ability to conduct electric current |
| physical change | change in the form of a substance that does not change its identity; Changes in matter that do not change the composition of the substance |
| malleability | ability to be made into thin sheets |
| composition | is the type of matter and its arrangement in an object |
| chemical change | process of changing into entirely new substances |
| reactivity | ability of two or more substances to combine to form new substances |
| flammability | ability of a substance to burn |
| physical change forms | Changes in matter that do not change the composition of the substance. e.g. water goes from solid to liquid to gas and back |
| physical change examples | shaping a bar of gold, melting a Popsicle, sanding a piece of wood |
| liquid density properties | densest liquid settle to the bottom, less dense liquid will float on top of the water |
| Chemical properties vs physical properties | Chemical properties change the substance's identity so they are harder to observe than physical properties |
| Characteristic properties | help scientists identify matter. |
| chemical change examples | soured milk, rusted metal, digested food` |
| composition changes | best way to tell if a chemical change has taken place |
| Type of chemical property | reactivity, flammability, nonflammability |
| Type of physical properties | color, state, hardness, solubility, electrical conductivity, density, malleability |