science vocabulary words

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Across
  1. 2. they can be homogeneous or heterogeneous
  2. 6. also known as SI
  3. 9. examples:flammability and the ability to rust
  4. 11. used to represent compounds
  5. 13. mass over volume
  6. 14. differs on different planets
  7. 15. never changes no matter where you are
  8. 16. everything is this
Down
  1. 1. can be measured using a graduated cylinder
  2. 2. two or more atoms
  3. 3. pure matter
  4. 4. substance that cannot be broken down
  5. 5. examples:boiling and melting
  6. 7. has a nucleus and a cloud of negative charge
  7. 8. a different number of atoms in a formula represents a different _________
  8. 10. a molecule is held together by this
  9. 12. he studies ________ to find out more about matter