Across
- 6. combined and visible change.
- 7. a substance that cannot be decomposed into simpler substances.
- 8. are the characteristic of a substance that may occur when it participates in a chemical reaction.
- 9. composed of two or more elements held together by chemical bonds.
- 10. the smallest unit of matter.
Down
- 1. can change the appearance or chemical properties of a substance.
- 2. two or more substances combined, but not by chemical bonds.
- 3. A form of matter that has a constant chemical composition and characteristic properties.
- 4. combined but no physical change.
- 5. can be observed or measured without changing the composition of matter.