| Term | Definition |
|---|
| element | a pure substance that cannot be broken down into any simpler substances |
| atom | the smallest particle that has the properties of an element |
| proton | particles that are located in the nucleus at the center of the atom and carry one unit of positive electric charge |
| neutron | located in the center of the nucleus |
| electron | located outside the nucleus of an atom that carry one unit of negative electric charge |
| molecule | a particle that contains two or more atoms joined together |
| mixture | a physical combination of two or more substances that does not form a new substance |
| mass | the amount of matter in an object |
| matter | anything that has mass and takes up space |
| density | a measure of how tightly matter is packed in an object |
| volume | the amount of space that an object takes up |
| periodic table | a chart that shows all of the known elements and their properties |
| chemical change | a change that causes a new kind of matter to form without different properties |
| solubility | the greatest amount of a solute that can be dissolved by a given amount of solvent |
| solution | a mixture that is blended so completely that it looks the same everywhere |
| solute | the substance in a solution that dissolves |
| solid | matter in a state that has a definite shape and volume |
| property | a trait of something that can be observed and measured |
| gas | matter in a state that has no definite shape or volume |
| liquid | matter in a state that has definite volume but not a definite shape |
| compound | a substance formed by the chemical combination of two or more elements held together by chemical bonds that cannot be separated by physical means |
| cylinder | tool that can be used to measure volume |
| physical change | involves a change in physical properties but does not change their chemical nature |
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