Grade 9 Chemistry

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Across
  1. 2. A type of fuel
  2. 4. This is formed when charcoal burns
  3. 8. How many electrons fit in the first shell
  4. 9. This material can be used instead of glass to measure temperature changes in chemical reactions
  5. 10. This is formed with the combustion of hydrogen
  6. 11. An element with the chemical symbol Si
  7. 13. Rusting is this type of reaction
  8. 15. This is needed for combustion
  9. 16. These are found inside the nucleus
  10. 18. One of the noble gases
  11. 20. This is where you find electrons
  12. 23. An element with the chemical symbol Be
  13. 26. Dissolving this chemical is an endothermic process
  14. 27. In an exothermic reaction the temperature .........
  15. 28. Group 1 elements are known as the......
  16. 29. The chemical name for rust
  17. 31. He discovered the electron
Down
  1. 1. This substance added to citric acid is an endothermic reaction
  2. 3. In an endothermic reaction, the temperature .......
  3. 5. These atomic particles have no charge
  4. 6. Group 8 elements are known as .........
  5. 7. Group 7 elements are known as the........
  6. 12. A type of fuel
  7. 14. This is formed when calcium reacts with hydrochloric acid
  8. 17. He discovered the proton
  9. 19. These are on the left-hand side of the Periodic Table
  10. 21. One of the alkali metals
  11. 22. These are found on the right-hand side of the Periodic Table
  12. 24. 20% of the air is this gas
  13. 25. An example of an endothermic process
  14. 30. How many electrons fit in the second shell