8th Grade Review

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Across
  1. 3. Atoms are mostly made of this
  2. 5. When heat is added, molecules move ____
  3. 6. Material that comes from the Earth or natural resources
  4. 7. Mass per unit volume
  5. 9. Positively charged subatomic particles
  6. 11. Process that changes liquids to solids
  7. 13. Atoms on the left side of a chemical reaction
  8. 14. Process that changes solids to liquids
  9. 15. Material that is manmade in some way
  10. 16. State of matter with molecules most tightly packed
Down
  1. 1. State of matter with molecules most spread out
  2. 2. Number that signifies the number of protons and neutrons in an atom
  3. 4. Negatively charged subatomic particles
  4. 8. An atom with an unequal number of protons and neutrons
  5. 9. Atoms on the right side of a chemical reaction
  6. 10. A chemical equation with equal molecules on both sides
  7. 12. Two Hydrogen atoms bonded with one oxygen atom forms this molecule