| A | B |
|---|
| chemistry | the study of matter |
| matter | anything that has mass and volume |
| mass | weight (g, kg, lbs.) |
| volume | amount of space it takes up (L, mL, gal.) |
| solids | definite shape and volume, very dense |
| liquid | definite volume, no definite shape, moderately dense |
| gas | no definite shape or volume, low density |
| density | mass per unit volume |
| element | cannot be broken down even by chemical means |
| total elements | 118 |
| natural elements | 92 |
| man-made elements | 26 |
| compound | 2 or more elements chemically bonded together that can only be seperated by chemical means |
| mixture | 2 items placed together that are not bonded together and are easily seperated |
| homogeneous | evenly blended, cannot see the seperate parts |
| heterogeneous | not evenly blended, can see the individual parts |
| physical change | changes appearance only, can be undone |
| chemical change | changes identity of substance, cannot be undone |
| physical properties | can be detected by the senses (color, smell,texture,etc) |
| chemical properties | retain to the behavior of the substance (melting point, bonding, etc) |
| evaporation | liquid to gas...boiling |
| sublimation | solid to gas |
| melting | solid to liquid |
| condensation | gas to liquid |
| freezing | liquid to solid |
| energy | the ability to do work |
| potential energy | energy at rest |
| kinetic energy | energy of motion |
