Form 4 Chemistry Paper 3-Questions

Get the Answers here Form 4 End Term 1 Exams 2023 Questions and Answers

CHEMISTRY

 (CONFIDENTIAL)

Requirements for candidates

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

1. about 100cm³ of solution F
2. about 50cm³ of solution G
3. 30cm³ of solution M
4. 30cm³ of solution N
5. one burette 0 – 50ml
6. one pipette 25ml
7. two conical flasks
8. 100ml measuring cylinder
9. 200ml or 250ml beaker
10. About 500ml distilled water
11. Phenolphthalein indicator
12. thermometer ( 0 – 110⁰C)
13. Source of strong heat (preferably Bunsen burner)
14. clock or stop watch
15. 2 boiling tubes
16. one CLEAN METALLIC spatula
17. 6 clean dry test-tubes
18. one test-tube holder
19. at least 6cm length of universal indicator paper
20. 0.5g of sodium hydrogen carbonate
21. pH chart pH 1 – 14
22. Bromine water supplied with a dropper
23. 0.5g of solid K – oxalic acid.
24. 0.5g of solid P – Sodium sulphite

The students should have access to the following

1. 2.0M NaOH solution with a dropper
   1. 1.0M barium nitrate solution with a dropper
   1.  Bromine water with a dropper
   1. Acidfied potassium manganate (vii) with a dropper
   1. 2.0M HCl with a dropper
2. Bromine water is prepared by adding 1ml of liquid bromine to 100cm³ of distilled water and shaking thoroughly in a fume cupboard.

• Acidified potassium permanganate is prepared by adding 3.16g of solid potassium permanganate to 400cm³ of 2M sulphuric acid and diluting to one litre of solution using distilled water.

• Solution M is made by dissolving 12.6g of oxalic acid in 400cm³ distilled water and making it to 1 litre.

• Solution N is prepared by dissolving  3.16g of potassium manganate (VII) in 200cm³ of 2M sulphuric acid and adding more water to make 1 litre

• Solution F is prepared by dissolving 4g of sodium hydroxide pellets in about 800cm³ of distilled water and diluting it to one litre solution.

• Solution G is prepared by dissolving 9.0g of oxalic acid (ethan-1,2-dioic acid) in 200cm³ of distilled water and diluting it to 250cm³ solution.