CHANGING MATERIALS - use the knowledge organiser on the back

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