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science chapter 2
describing matter
| Question | Answer |
|---|---|
| matter | anything that has mass and occupies space |
| chemistry | the study of the properties of matter and how matter changes |
| substance | a single kind of matter that is pure and has a specific set of properties |
| physical property | a characteristic of 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 a different substance |
| element | a pure substance that cannot be broken down into other substance by chemical or physical means |
| atom | the basic particle from which all elements are made |
| chemical bond | the force that holds atoms together |
| molecules | a neutral particle made of two or more atoms joined by covalent bonds |
| compound | a pure substance made of two or more elements chemically combined |
| chemical formula | a combination of symbols that represents the elements in a compound and their proportions |
| mixture | two or more substances that are mixed together, but does not chemically combined |
| heterogeneous mixture | a mixture in which pure substances are unevenly distributed throughout the mixture |
| homogeneous mixture | a mixture in which substance are evenly distributed throughout the mixture |
| solution | a well mixed mixture containing a solvent and at least one solute that has the same properties throughout |
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