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

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 110^o
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. P^H
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.