Principles of chemistry

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Across
  1. 4. elements which do no react to form compounds nor diatomic molecules
  2. 7. a substance made up of 2 different elements chemically bonded together
  3. 10. the tendency of an element to form a compound
  4. 12. a compound which breaks down to release oxygen
  5. 15. a -2 charge group which can decompose to release carbon dioxide
  6. 16. a toxic green gas which bleaches damp blue litmus paper white
  7. 17. very reactive metals which react with water to form an alkali solution
  8. 18. method used to remove water to form crystals
  9. 19. the compound formed when sodium reacts with oxygen
  10. 20. element in group 2 period 4
  11. 21. the gas formed when calcium carbonate is thermally decomposed
Down
  1. 1. a gas which reignites a glowing splint
  2. 2. method used to separate an insoluble solid from a liquid
  3. 3. a solid which cannot be dissolved
  4. 5. a group 7 elements
  5. 6. a solid which can be dissolved
  6. 8. a gas which makes a squeeky pop when tested with a lighted splint
  7. 9. a clear solution which turns cloudy when carbon dioxide is bubbled through it
  8. 11. method used to separate different colour inks/ colours
  9. 13. separating method used to separate mixtures based on their boiling points
  10. 14. a -2 charge group made of sulfur and oxygen