| A | B |
|---|
| chemistry | the science concerned with the composition of substances and the changes they undergo. |
| gas | matter with neither a shape or volume |
| liquid | matter with a definite volume, but not a definite shape |
| mass | the quantity of matter that a substance possesses |
| matter | anything that occupies space and has mass |
| solid | matter with a definite size and shape |
| reaction | a chemical transformation or change |
| volume | the amount of space occupied by a substance |
| atom | the smaller particle of an element that retains the properties of the element and can enter into a chemical reaction |
| compounds | substances made up of more than one type of atom |
| elements | substances made up on only one type of atom |
| heterogeneous mixture | mixture with inconsistent, non-uniform composition |
| homogeneous mixture | mixtures that have definite, consistent properties |
| mixtures | two or more substances that are physically combined |
| periodic table | a way of presenting all the elements so a to show their similarities and differences |
| pure substance | a substance that has a defined compostition and cannot be separated into simpler substances by physical means |
| solution | a homogenous mixture of one or more substances dissolved in another substance |
| atomic number | the number of protons in the nucleus of an atom |
| formula | a group of symbols showing what elements make up a compound |
| symbols | short representations of the names of chemical elements |
