Across
- 2. substances undergo a chemical change
- 5. a chemical substance that cannot be broken down further
- 6. two or more atoms connected by chemical bonds
- 7. substance with loose free particles
- 9. a mixture that appears uniform throughout
- 10. the end of a chemical reaction
- 13. substance composed of identical molecules
- 14. two or more substances that are not chemically combined
- 16. positive subatomic particle in the nucleus
- 17. substance with tightly packed particles
Down
- 1. the start of a chemical reaction
- 3. negative subatomic particle surrounding the nucleus
- 4. neutral subatomic particle in the nucleus
- 8. smallest unit of an element
- 9. a mixture that has distinguishable parts
- 11. substance that can flow
- 12. anything that takes up space
- 15. mass per unit volume