| Term | Definition |
|---|
| elements | a pure substance that cannot be broken down into any other substances by chemical or physical means (92 of them occur naturally) |
| atoms | the smallest possible piece of matter |
| nucleus | positive charge center |
| bond | a force of attraction between two atoms |
| compounds | a pure substance made of two or more elements chemically combined in a set ratio |
| mixtures | made of two or more substances (elements, compounds, or both) that are combined |
| heterogeneous mixture | a mixture in which pure substances are unevenly distributed throughout the mixture |
| homogeneous mixture | a mixture in which substances are evenly distributed throughout the mixture |
| solid | a state of matter that has a definite shape, definite volume, is rigid and has low compressibility |
| crystalline | solids whose particles form a regular pattern |
| amorphous | solids whose particles are not arranged in a regular pattern and that do not melt at a distinct temperature but get softer and softer as temperature increases |
| liquid | a state of matter that has no definite shape, definite volume, is fluid, and has low compressibility |
| gas | a state of matter which has no definite shape or volume, is fluid, and is compressible |
| acid | compounds that share characteristic properties in the kind of reactions they undergo |
| indicator | a compound that changes color in the presence of an acid or a base |
| base | another group of compounds that can be identified by their common properties |
| chemical changes | a change in which one or more substances combine or break apart to form new substances |
| matter | anything that has mass and takes up space |
| chemistry | the study of properties of matter and how matter changes |
| substance | a single kind of matter that is pure, always has a specific make-up, or composition, and a specific set of properties |
| property | a characteristic |
| physical property | a characteristic of a pure substance that can be observed without changing it into another substance |
| chemical property | a characteristic of a pure substance that describes its ability to change into different substances |
Combine with other sets
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