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Christopher Whitehead Sixth Form: A-level Chemistry Summer Bridging Task

Christopher Whitehead Sixth Form: A-level Chemistry Summer Bridging Task. Do not print out, just run through the slide show. How to work out chemical formulae. Watch the youtube clip to explain how to work out the formula of a given Compound – JUST WATCH THE FIRST VIDEO CLIP.

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Christopher Whitehead Sixth Form: A-level Chemistry Summer Bridging Task

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  1. Christopher Whitehead Sixth Form:A-level Chemistry Summer Bridging Task Do not print out, just run through the slide show.

  2. How to work out chemical formulae Watch the youtube clip to explain how to work out the formula of a given Compound – JUST WATCH THE FIRST VIDEO CLIP. https://www.youtube.com/watch?v=p9iQ5Qn42DM Then work out the formula of the following compounds. The answers will come when you ‘click’

  3. Straightforward formulae first

  4. Li+ F- What are the ions? lithium fluoride What is the formula? LiF

  5. Zn2+ O2- What are the ions? zinc oxide What is the formula? ZnO

  6. Na+ Cl- What are the ions? sodium chloride What is the formula? NaCl

  7. Mg2+ S2- What are the ions? magnesium sulfide What is the formula? MgS

  8. K+ I- What are the ions? potassium iodide What is the formula? KI

  9. Now for some slightly more challenging formulae

  10. Fe2+ Cl- What are the ions? iron (II) chloride What is the formula? FeCl2 Fe2+ Cl- Cl-

  11. Cu+ O2- What are the ions? cuprous oxide What is the formula? Cu2O Cu+ O2- Cu+

  12. Na+ O2- What are the ions? sodium oxide What is the formula? Na2O Na+ O2- Na+

  13. Mg2+ Br- What are the ions? magnesium bromide What is the formula? MgBr2 Mg2+ Br- Br-

  14. K+ S2- What are the ions? potassium sulfide What is the formula? K2S K+ S2- K+

  15. Ba2+ Cl- What are the ions? barium chloride What is the formula? BaCl2 Ba2+ Cl- Cl-

  16. Fe3+ Br- What are the ions? Iron (III) bromide What is the formula? FeBr3 Fe3+ Br- Br- Br-

  17. Fe3+ O2- What are the ions? Iron (III) oxide What is the formula? Fe2O3 Fe3+ O2- Fe3+ O2- O2-

  18. Now lets add some examples when complex ions are needed.

  19. Ca2+ CO32- What are the ions? calcium carbonate What is the formula? CaCO3

  20. Na+ OH- What are the ions? sodium hydroxide What is the formula? NaOH

  21. Al3+ PO43- What are the ions? aluminium phosphate What is the formula? AlPO4

  22. NH4+ NO3- What are the ions? ammonium nitrate What is the formula? NH4NO3

  23. Zn2+ SO42- What are the ions? zinc sulfate What is the formula? ZnSO4 Zn2+ SO42-

  24. Na+ CH3COO- What are the ions? sodium ethanoate What is the formula? NaCH3COO Na+ CH3COO-

  25. Ba2+ SO42- What are the ions? barium sulfate What is the formula? BaSO4 Ba2+ SO42-

  26. Cu2+ SO42- What are the ions? copper (II) sulphate What is the formula? CuSO4

  27. Na+ HCO3- What are the ions? sodium hydrogencarbonate What is the formula? NaHCO3 Na+ HCO3-

  28. Ag+ NO3- What are the ions? silver nitrate What is the formula? AgNO3

  29. Now lets add some examples when more than one complex ion are needed. Same rules apply but brackets are needed if more than one complex ion is required.

  30. NH4+ O2- What are the ions? ammonium oxide What is the formula? (NH4)2 O NH4+ O2- NH4+

  31. NH4+ SO42- What are the ions? ammonium sulfate What is the formula? (NH4)2 SO4 NH4+ SO42- NH4+

  32. NH4+ PO43- What are the ions? ammonium phosphate What is the formula? (NH4)3 PO4 NH4+ PO43- NH4+ NH4+

  33. Fe2+ OH- What are the ions? Iron (II) hydroxide What is the formula? Fe(OH)2 Fe2+ OH- OH-

  34. Fe3+ OH- What are the ions? Iron (III) hydroxide What is the formula? Fe(OH)3 Fe3+ OH- OH- OH-

  35. Al3+ CH3COO- What are the ions? aluminium ethanoate What is the formula? Al(CH3COO)3 Al3+ CH3COO- CH3COO- CH3COO-

  36. Al3+ SO42- What are the ions? aluminium sulfate What is the formula? Al2(SO4)3 Al3+ SO42- Al3+ SO42- SO42-

  37. Ca2+ PO43- What are the ions? calcium phosphate What is the formula? Ca3 (PO4)2 Ca2+ PO43- Ca2+ PO43- Ca2+

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