Matter

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