| A | B |
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| Chemistry | The scientific study of the composition, structure, and properties of matter and the changes that matter undergoes.,  |
| Chemical | Any substance that has a defined composition.,  |
| Mass | A measure of the amount of matter in an object.,  |
| Matter | Anything that has mass and takes up space.,  |
| Atom | The smallest unit of an element that maintains the chemicial properties of that element.,  |
| Element | A substance that cannot be separated or broken down into simpler substances by chemical means; All atoms of an element have the same atomic number.,  |
| Compound | A substance made up of atoms of two or more different elements joined by chemical bonds.,  |
| Extensive property | A property that depends on the extent or size of a system.,  |
| Intensive property | A substance that forms in a middle stage of a chemical reaction and is considered a stepping stone between the parent sbstance and the final product.,  |
| Physicial property | A characteristic of a substance that does not involve a chemical change, such as density, color, or hardness.,  |
| Physicial change | A change to matter from one form to another without a change in chemical properties.,  |
| Change of state | The change of asubsance from one physicial state to another.,  |
| Solid | The state of matter in which the volume and shape of a substance are fixed.,  |
| Gas | A form of matter that does not have a definite shape or volume.,  |
| Plasma | In physicial science, a state of matter that starts as a gas and then becomes ionized; It consists of freemoving ions and electrons, it takes on an electric charge, and its properties diffeer from those oa solid, liquid, or gas.,  |
| Chemical property | A property of matter that describes a substance's ability to participate in chemical reactions.,  |
| Chemical change | A change that occurs when one or more substances with different properties,  |
| Chemical Reaction | The process by which one or more substances change to produce one or more different substances.,  |
| Reactant | A substance or molecule that participates in a chemical reaction,  |
| Group | A vertical column of elements in the periodic table; Elements in a group share chemical properties.,  |
| Family | A vertical column of the periodic table.,  |
| Period | In chemistry, a horizontal row of elements in the periodic table.,  |
| Metal | An element that is shiny and that conducts heat and electricity well.,  |
| Nonmetal | An element that conducts heat and electricity poorly and that does not form positive ions in an electrolytic solution.,  |
| Metalloid | An element that has properties of both metals and onmetals: sometimes referred to as a semiconductor.,  |
| Liquid | The state of matter that has a definite volume but not a definite shape.,  |
