Science Test Review

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Across
  1. 3. an irreversible change - burning paper
  2. 9. a mixture in which the concentration is not uniform
  3. 10. elements on the periodic table are arranged in order of increasing
  4. 13. a molecule composed of two or more separate elements
  5. 14. the most reactive elements on the periodic table
  6. 15. made when two or more substances are combined
  7. 16. the mass of an atom comes from the protons and ____
  8. 18. particles are tightly packed and fixed
  9. 19. A property that can be observed/measured
Down
  1. 1. a change that is reversible - ice melting
  2. 2. horizontal row on the periodic table
  3. 4. a process where water vapor becomes liquid
  4. 5. a process where liquid turns into a vapor
  5. 6. particles are packed closely but can move freely, definite volume
  6. 7. heat energy is ____________ during condensation
  7. 8. Flammability and toxicity are examples of a
  8. 11. is dissolved in a solution
  9. 12. any substance capable of dissolving one or more substances
  10. 17. formed when two or more metals are combined(brass)