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Across 3. In a reaction between Cr2O72- and Fe2+ the resulting colour is_______ 4. The alkaline _______in a compound are always assigned an oxidation number of +2 6. The iodide ion is a_______ agent. 9. A reaction is not_______if there is no reduction and oxidation. 12. Whenever a fuel is burnt, the carbon is _______. 13. When bleach is added to Fe(II) solution, it went from colourless to ____. 15. The reaction of photosynthesis is _______-in relation to that of respiration 16. In the reaction of iron (ii) and chlorine, chlorine is acting as the____ 18. The____ metals in a compound have an oxidation number of +1 20. Half-ionic equations always contain_______. 25. The loss of electrons is reffered to as________ 27. In PO43-, phosphorus’ oxidation number is plus_________ 28. In any given redox reaction, oxidation and reduction occurs________ 30. When writing an ionic equation, you must remove the ____ ions.

Down 1. An oxidising agent itself is__________ 2. The _____on a complex ion is the sum of the oxidation numbers of the species in that ion. 5. Oxygen in compounds is assigned an oxidation number of -2 except in a 7. In a reaction between KMnO4 and Fe2+ , permanganate goes from______to colourless 8. When oxidised this specie may change from (+2) to( +3). 10. _________ peroxide can be both an oxidising and reducing agent 11. In a reaction between Cl2 and NaI the resulting colour is ________ 14. The oxidation number of a specie that consists a_____ion equal to the charge on that ion. 17. In a compound______is always assigned +3 18. Sulphuric acid is used to_______ some oxidizing agents 19. __________ In compounds is always given an oxidation number of -1 21. Cl2 + 2Fe2-> 2Cl- + 2Fe3+: In this equation iron (II) acts as the______ 22. Chlorine is a very powerful_______agent. 23. The oxidation number of a specie becoming more negative is called____ 24. Elements in their_______state have an oxidation number of zero. 26. Carbon in C6H12O6 is assigned an oxidation number of_________. 29. Chemically uncombined elements are assigned an oxidation number of _________