Across
- 2. toxic gas made in incomplete combustion
- 4. type of combustion with limited oxygen
- 7. gas needed for combustion
- 9. sound made when testing for hydrogen
- 11. process that traps heat in the Earth’s atmosphere
- 14. reaction where a substance gains oxygen
- 15. change that is temporary and easy to reverse
- 18. type of combustion with plenty of oxygen
- 19. law stating mass of reactants equals mass of products
- 20. reaction that gives out thermal energy
Down
- 1. test used to identify oxygen
- 3. compound that breaks down when heated
- 5. substance that provides useful energy
- 6. another word for burning
- 8. rain formed when acidic gases dissolve in water droplets
- 10. breaking down of a compound by heating
- 12. reaction that takes in thermal energy from the surroundings
- 13. liquid used to test for carbon dioxide
- 16. gas produced in complete combustion
- 17. change that forms new substances