CHEMISTRY PAPER 3 CONFIDENTIAL - KCSE 2019 JOINT PRE MOCK EXAMINATION - NAMBALE

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CONFIDENTIAL INSTRUCTIONS TO SCHOOLS

In addition to the apparatus and fittings found in a chemistry laboratory, each candidate will require the following:

  1. Exactly 6 cm length of new magnesium ribbon solid A in a stoppered container.
  2. About 50 cm3of HCl solution
  3. About 150cm3of 0.2M sodium hydroxide, solution C.
  4. One pipette, 25.0ml.
  5. One pipette filler.
  6. One volumetric flask, 250ml.
  7. Two labels.
  8. About 300cm3 of distilled water.
  9. One burette 50.0ml.
  10. Three conical flasks.
  11. One 10ml measuring cylinder.
  12. One 50ml measuring cylinder.
  13. One boiling tube.
  14. One thermometer -100c to 110o
  15. About 0.5g solid F supplied in a stoppered container.
  16. Five dry clean test tubes.
  17. About 0.5g of Solid G supplied in a stoppered container.
  18. Stop watch/clock
  19. One 100ml beaker.
  20. About 500cm3 of distilled water.
  21. A scapel
  22. One 30 cm ruler

ACCESS TO

  1. Aqueous sodium sulphate solution supplied with a dropper.
  2. 2M aqueous Ammonia supplied with a dropper.
  3. 2M sodium hydroxide solution
  4. 5M Lead (II) Nitrate solution supplied with a dropper.
  5. 5M Barium Chloride solution supplied into a dropper
  6. Bromine water supplied into a dropper.
  7. Acidified Potassium dichromate (VI) solution supplied into a dropper.
  8. Universal indicator solution supplied with a dropper.
  9. PH
  10. Phenophthelin indicator supplied with a dropper.

NOTES

  1. 2M Sodium Hydroxide solution Q is prepared by dissolving 80g of Sodium Hydroxide pellets in about 600cm3 of distilled water and diluting to 1 litre solution.
  2. Acidified Potassium Manganate (VII) is prepared by dissolving 3.16g of solid Potassium Manganate (VII) in about 600cm3 of 2M Sulphuric (VI) acid and adding distilled water to make a litre of solution.
  3. Solution B is prepared by dissolving 172cm3 of concentrated Hydrochloric acid in distilled water and diluting to make one litre solution.
  4. 2M aqueous Ammonia is prepared by dissolving 298cm3 of concentrated Ammonia in distilled water and diluting to one litre of solutiolesn.
  5. 2M H2S04 acid is prepared by dissolving 55cm3 of concentrated Sulphuric (VI) acid in distilled water and diluting to make one litre solution.
  6. Solid E is pure Aluminum nitrate.
  7. Solid F is pure Oxalic acid.

NB

Teacher in charge of chemistry to perform the experiment and fill tables II and III.


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