Across
- 4. material composed uniformly (oxygen gas)
- 6. a measure of concentration
- 9. element I; necessary for the human thyroid; in aquatic plants
- 11. a chemical reaction that produces heat
- 14. a method to discover concentration
- 15. nitrous oxide or laughing gas
Down
- 1. substances with pH above 7
- 2. lysergic acid dythalimide, "acid"
- 3. main building block of living organisms; basis of organic molecules
- 5. O or O2; a clear, odorless gas
- 7. 6.022x10-23
- 8. a chemical reaction that requires heat
- 10. material composed of different substances (air)
- 12. Avogadro's number of a substance
- 13. substances with pH below 7