BC SL

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Across
  1. 6. quantity of an object; amount of matter in something
  2. 7. no mass created/destroyed in chemical reaction
  3. 9. law of ___ of mass
  4. 10. substance after chemical reaction
Down
  1. 1. substance before chemical reaction
  2. 2. mass created/destroyed in chemical reaction
  3. 3. Lavoisier french chemist from 18th century
  4. 4. anything that has mass and takes up space
  5. 5. amount of protons found in the nucleus of an element
  6. 8. building blocks of all mass