Across
- 3. building block of life
- 5. a substance that takes up space
- 6. a degree of compactness of a substance
- 8. a substance that flows freely and doesn't have a constant volume
- 11. a positively charged part in the nucleus of an atom
- 12. an invisible force or field caused by the unique properties of certain materials.
Down
- 1. mass the mass of a single atom of a chemical element.
- 2. a mix of something
- 4. a good conductor of electricity and heat
- 7. a negatively charged part in the nucleus of an atom
- 9. Substances in plants and animals that speed biochemical reactions
- 10. a firm and stable shape
- 13. a substance that expands freely