Across
- 2. have a shiny appearance
- 5. substances containing one kind of atom
- 6. dull not shiny
- 7. change reversible-can be turned back
Down
- 1. two or more atoms chemically combined
- 2. two or more different substances that are not chemically combined
- 3. change not reversible- can't be turned back
- 4. two or more different atoms chemically combined