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