Science Unit B

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Across
  1. 5. studied chemical reactions
  2. 7. Slow chemical change that occurs when oxygen in the air reacts to metal
  3. 10. no additional material is allowed to enter or leave
  4. 13. material is allowed to leave and enter
  5. 14. organic catalyst
  6. 16. NaCl
  7. 17. releases heat
  8. 20. the 7 rows in the periodic table
  9. 22. occurs when oxygen reacts with a new substance to form a new substance and give off energy
  10. 23. book describing the achievements of alchemists
Down
  1. 1. Workplace Hazardous Materials Information System
  2. 2. the 18 columns in the periodic table
  3. 3. hardest material on the Mohs' hardness scale
  4. 4. substances that help a reaction proceed faster
  5. 6. experimented with the behavior of gases
  6. 7. the mass of the reactants always equal the mass of the products
  7. 8. absorbs heat
  8. 9. used the word "Atomos"
  9. 11. 1 electron 1 proton and 0 neutrons
  10. 12. the last Alkali metal on the Periodic table of elements
  11. 15. Gas to Solid and vice versa
  12. 18. a new substance produced in a chemical reaction
  13. 19. a substance that reacts with another substance or substances to create something new
  14. 21. "indivisible'