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