C2 Crossword

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Across
  1. 4. system Open system
  2. 6. Energy
  3. 9. Salt
  4. 12. Chem reaction bewteen a base and an acid
  5. 13. agent Oxidising agent
  6. 18. Alkali
  7. 19. A natural resource that will run out
  8. 20. Stored energy is released
  9. 21. Substance loses oxygen
  10. 23. of conversation of mass Tocom
  11. 24. system Closed system
Down
  1. 1. Gives out energy change exo
  2. 2. Endothermic
  3. 3. Hydrogen and carbon
  4. 5. The natural effect
  5. 7. Rise in average wordl temps
  6. 8. Carbonate
  7. 10. Chemical reaction where a substance gains
  8. 11. Source that will not run out
  9. 14. A chemical reaction that is also known as burning
  10. 15. A chemical less than 7
  11. 16. Describes the product formed in the oxidation of fat
  12. 17. Base
  13. 22. dioxide Gas that form 0.04% of the air