Across
- 3. The simplest unit of a chemical compound
- 6. The name for a gas which absorbs infrared radiation
- 7. A reaction that takes in heat
- 8. The scientific name for burning
- 9. The result of corrosion
- 10. The term for the three things needed for a fir to burn
- 12. An electrically charged atom
- 13. A reaction that gives off heat
- 16. The basic unit of a chemical element
Down
- 1. A gas that takes up 21% of the air
- 2. A method to stop rusting
- 4. When metals react with air and water
- 5. A gas given off when burning
- 11. A gas that takes up 78% of the air
- 14. Multiple elements not chemically joined together
- 15. Multiple elements chemically joined together