Chemical reactions

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Across
  1. 3. The colour of a Sodium ion in a flame test
  2. 6. one of the five observations that shows a chemical reaction has happened
  3. 8. the name for a solid that forms in a chemical reaction
  4. 9. The colour of a Lithium ion in a flame test
  5. 12. The colour of a Calcium ion in a flame test
  6. 13. the colour of a Copper ion in a flame test
  7. 15. The colour of a Barium ion in a flame test
  8. 17. this evidence shows that a gas is being produced
  9. 19. the chemical that start a chemical reaction
  10. 20. the molten metal made at 2500C from the thermite reaction
Down
  1. 1. a chemical reaction that can go forwards and backwards
  2. 2. has the formula CO2
  3. 4. this is a chemical reaction where oxygen is added
  4. 5. Lithium Sodium and Potassium all belong to this reactive group of metals
  5. 6. a gas that is added to swimming pools to kill viruses and bacteria
  6. 7. the gas that makes a squeeky pop when it is set alight
  7. 10. the name for a reaction that gets colder
  8. 11. this is another name for burning
  9. 14. the chemicals that are made in a chemical reaction
  10. 16. the name for a reaction that gets hotter
  11. 18. the colour of a Potassium ion in a flame test