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Preparation for Practical chemistry

Exercise on Chemistry Paper 4= 2014= form 5. Preparation for Practical chemistry. Paper 4- practical chemistry. 2 sections ( 1 ½ hour) Part A) carrying out experiment Example, taking volume, temperature, mass, time Then do calculations

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Preparation for Practical chemistry

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  1. Exercise on Chemistry Paper 4= 2014= form 5 Preparation for Practical chemistry

  2. Paper 4- practical chemistry • 2 sections ( 1 ½ hour) • Part A) carrying out experiment Example, taking volume, temperature, mass, time Then do calculations Part B) salt analysis – given unknown salt, you are asked to determine what the salt is

  3. Salt analysis • To identify cations ( ions that go to the cathode , that is positive ions) • To identify anions ( ions that go to the anode , that is negative ions )

  4. SALT ANALYSIS - cations No change blue

  5. How to test ammonium ion

  6. Test for ammonium ion – click to play

  7. SALT ANALYSIS - cations

  8. NO NO

  9. How to test calcium ion

  10. White ppt

  11. How to test zinc ion shake

  12. Video test on zinc ion- click to play

  13. White ppt sodium

  14. How to test Aluminium ion shake

  15. yellow

  16. How to test lead ion

  17. green cyanoferrate Potassium brown

  18. NO

  19. Test for anions Brown ring formed

  20. Test for anions Bubbles of gas produced that turn lime water cloudy

  21. Test for anions White precipitate

  22. Test for anions White precipitate

  23. 2) ( remember this table )Effect of heating on salts oxygen

  24. metal decompose

  25. 3) Solubility of salts silver calcium

  26. Soluble and insoluble in water Insoluble in water Soluble in water

  27. Ammonium

  28. 4) Colour of substances carbonate Green Brown

  29. Yellow Orange Black

  30. white yellow brown yellow

  31. 5) Identify salts OR cation OR anion below

  32. Zinc carbonate Mg 2+ ion/ magnesium ion

  33. Al 3+ OR Pb 2+ ion Zn 2+ ion

  34. Ca 2+ ion Fe 3+ ion

  35. Cl – ion Chloride ion CO32- ion Carbonate ion

  36. NO3– ion Nitrate ion SO42– ion sulphate ion

  37. Pb 2+ ion/ lead(II) ion Al 3+ ion / aluminium ion

  38. Salt Y • Gas CO2 • Salt Y is carbonate salt • Residue is lead(II) oxide

  39. Salt Y • Residue is a carbonate salt

  40. X contains Zn2+ / Al3+ /Pb2+

  41. X contains Al3+ /Pb2+

  42. X contains Pb2+ ion • Lead(II) carbonate

  43. Salt W is zinc nitrate . Fill in the table below for expected results • Brown gas and • gas that rekindle glowing wooden splinter formed • Residue is yellow when hot and white when cold • NO2 gas and O2 gas • Y contains nitrate • Residue is zinc oxide

  44. Salt W is zinc nitrate . Fill in the table below for expected results • Residue dissolves in acid • Residue is a base

  45. Add NaOH solution, little first, then in excess • X contains Zn2+ / Al3+ /Pb2+ • White precipitate, soluble in excess

  46. Add NH3 aq, solution, little first, then in excess • X contains Zn2+ • White precipitate, soluble in excess

  47. Question 3 – Solution Q is magnesium chloride • Add NaOH solution, little first, then in excess • X contains Mg2+ / Ca2+ • White precipitate

  48. Add NH3 solution, little first, then in excess • X contains Mg2+ • White precipitate

  49. Add HCl followed by barium chloride solution • No sulphate ion • No change

  50. Add nitric acid followed by AgNO3 solution • Chloride ion present • White precipitate

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