| A | B |
|---|
| physical change | a change of matter from one form to another without a change in chemical properties |
| pure substance | a sample of matter, either a single element or single compound, that has definite chemical and physical properties |
| heterogeneous | a mixture of dissimilar components. Not the same throughout. |
| molecule | the smallest unit of a substance that keeps all of the physical and chemical properties of that substance. |
| chemical change | a change that occurs when a substance changes composition by forming one or more new substances |
| homogeneous | a mixture that has uniform structure or composition throughout. The same throughout. |
| atom | the smallest unit of an element that maintains the properties of that element |
| mixture | a combination of two or more substances that are not chemically combined. |
| matter | anything that has mass and takes up space |
| compound | a substance made up of two or more different elements joined by chemical bonds |
