12 science vocab word

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Across
  1. 2. an observable characteristic of an object - can be chemical or physical
  2. 4. the amount of matter something has
  3. 6. is a small piece of matter
  4. 9. A chemical reaction in which heat is released
  5. 11. somthing that is made from somthing else
  6. 12. when chemical reaction heat is absorded
Down
  1. 1. The building block of matter
  2. 3. A substance that takes part in and undergoes change during a chemical reaction
  3. 5. A model of the electron cloud
  4. 7. An insoluble solid formed from a chemical reaction
  5. 8. when an atom has more electrons than protons
  6. 10. A negative charge in a atom