Science Unit B

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