| A | B |
|---|
| matter | Anything that has mass and occupies space. |
| physical property | A characteristic of a substance that can be observed without changing the substance into something else. |
| chemical property | A characteristic of a substance that can be observed without changing the substance into something else. |
| element | A characteristic of a substance that can be observed without changing the substance into something else. |
| compound | A substance made of two or more elements chemically combined in a set ratio. |
| mixture | Two or more substances that are mixed together but not chemically combined. |
| physical change | A change that alters the form or appearance of a substance but does not make the material into another substance. |
| chemical change | A change in matter that produces new substances. |
| substance | A single kind of matter that has distinct physical and chemical properties. |
| energy conversion | The process of changing one form of energy into another. |
| state | A form of matter; solid, liquid, or gas. |
| weight | A measure of the force of gravity on an object. |
| mass | A measure of how much matter is in an object. |
| International System of Units (SI) | A system of measurement based on multiples of ten and on established measures of mass, length, and time. |
| volume | The amount of space that matter occupies. |
| density | The measurement of how much mass of a substance is contained in a given volume. |
| atom | The smallest particle of an element. |
| nucleus | The central core of an atom, containing protons and usually neutrons. |
| proton | Small, positively charged particle in the nucleus of an atom. |
| neutron | Small uncharged particle in the nucleus of an atom. |
| electron | A tiny, negatively charged, high-energy particle that moves in the space outside the nucleus of an atom. |
| chemical bond | The force that holds two atoms together. |
| molecule | A particle made of two or more atoms bonded together. |
| chemical symbol | A chemical symbol is a notation of one to three letters representing an element. |
| chemical equation | An equation that describes what happens in a chemical reaction. |
