| A | B |
|---|
| atom | a tiny particle that is the fundamental building block of all substances and whose properties determine the properties of an element made up only of those atoms |
| chemical bond | a force of attraction that one atom or group of atoms has for another atom or group of atoms |
| chemical change | rearrangement of atoms of substances resulting in new substances; |
| chemistry | the study of the composition and structure of matter and the ways that substances react and change |
| compound | substance composed of two or more elements that are chemically bonded in a definite, fixed ratio by mass |
| conservation | means that the physical quantity of matter and energy is entirely preserved during transformations and reactions |
| element | a chemical substance that contains only one kind of atom and that cannot be broken down into simpler substances |
| heterogenous | having nonuniform composition throughout |
| homogenous | having uniform composition throughout |
| matter | anything that occupies space and has mass |
| mixture | matter that is physically combined or blended; mixtures have variable composition and properties and can be homogeneous (uniformly mixed) or heterogeneous |
| molecule | any compound resulting from one or more elements joined by electron sharing |
| nuclear change | change to the structure of the nucleus of an atom during a nuclear reaction |
| physical change | change to a substance that does not alter its chemical composition |
| physical science | the study of matter and energy and their interactions, which includes the disciplines of physics and chemistry |
| solution | a homogeneous mixture |
| pure substance | substance in which all samples of the substance have fixed composition and properties |
