Essential Equations

This is not mine, it is from this lovely website here:
http://www.a-levelchemistry.co.uk

They are from the AQA section and cover all the equations that you need to know for the unit 2 exam

 These notes go into more detail than is necessary, and I am hoping to upload condensed versions soon :)

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  • Created by: Megan1808
  • Created on: 31-05-13 18:38
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UNIT 2 ­ THE ESSENTIAL EQUATIONS
Group 7, The Halogens
1. Cl2(aq) + 2Br(aq) Br2(aq) + 2Cl(aq) displacement
2. Cl2(aq) + 2I(aq) I2(aq) + 2Cl(aq) displacement
3. Br2(aq) + 2I(aq) I2(aq) + 2Br(aq) displacement
4. H2SO4 + Cl HSO4 + HCl acidbase
5. H2SO4 + 2H+ + 2e SO2 + 2H2O reduction (by Br or I)
6. H2SO4 + 6H+ + 6e S + 4H2O reduction (by I)
7. H2SO4 + 8H+ + 8e H2S + 4H2O reduction (by I)
8. 2I(aq) I2(aq) + 2e oxidation by conc. H2SO4
9. 2Br(aq) Br2(aq) + 2e oxidation by conc. H2SO4
10. Ag+(aq) + Cl(aq) AgCl(s) precipitation
11. Ag+(aq) + Br(aq) AgBr(s) precipitation
12. Ag+(aq) + I(aq) AgI(s) precipitation
13. Cl2(g) + H2O(l) == HCl(aq) + HClO(aq) sterilising water
14. Cl2(g) + 2OH(aq) Cl(aq) + ClO(aq) + H2O(l) making bleach
Group 2, the Alkaline Earth Metals
15. Mg(s) + H2O(g) MgO + H2(g) magnesium and steam
16. Ca(s) + 2H2O(l) Ca(OH)2(s) + H2(g) calcium and water
17. Sr(s) + 2H2O(l) Sr(OH)2(s) + H2(g) strontium and water
18. Ba(s) + 2H2O(l) Ba(OH)2(s) + H2(g) barium and water
19. Mg2+(aq) + 2OH(aq) Mg(OH)2(s) solubility of hydroxides
20. Ca2+(aq) + 2OH(aq) Ca(OH)2(s) solubility of hydroxides

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Ca2+(aq) + SO42(aq) CaSO4(s) solubility of sulphates
22. Sr2+(aq) + SO42(aq) SrSO4(s) solubulity of sulphates
23. Ba2+(aq) + SO42(aq) BaSO4(s) solubulity of sulphates
Extraction of Metals
Extraction of iron
24. C(s) + O2(g) CO2(g) heat the furnace
25. C(s) + CO2(g) 2CO(g) produce the main reducing agent
26. Fe2O3(s) + 3CO(g) 2Fe(s) + 3CO2(g) reduce the iron (III) oxide
27. Fe2O3(s) + 3C(s) 2Fe(s) + 3CO(g) reduce the iron (III) oxide
28. CaCO3(s) CaO(s) + CO2(g) removing silicon dioxide
29.…read more

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WO3(s) + 3H2(g) W(s) + 3H2O(g) extracting tungsten…read more

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