States of Matter

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Across
  1. 3. the phase change in which a gas changes to a liquid
  2. 5. the phase change in which a liquid changes to a gas
  3. 6. the phase change in which a solid becomes a gas, bypassing the liquid phase
  4. 7. the combined mass of protons and neutrons in an atom
  5. 8. the temperature at which a substance begins to change phases from solid to liquid
  6. 11. a combination of two or more types of matter in which the components retain their individual properties
  7. 12. a chemical substance that is made up of two or more different kinds of atoms that are bonded together
Down
  1. 1. how tightly the molecules are packed together in the solid object, liquid or gas
  2. 2. the temperature at which a substance begins to change phases from liquid to gas
  3. 4. the central portion of the atom containing protons and neutrons
  4. 7. the number of protons in an atom's nucleus
  5. 9. a negatively charged particle that moves in an orbit shell outside an atom's nucleus
  6. 10. a positively charged particle in an atom's nucleus