Grade 9 Chemistry

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