Outline the steps in soap preparation from palm oil, identify the scientific principle, catalysts, and uses of impurities.

a) The correct sequence for the preparation of soap from palm oil is:

1. IV: Dry cocoa pods are burnt into ash.
2. I: Water is added to the cocoa pod ash, stirred and filtered.
3. III: Palm oil is poured into a can and heated.
4. V: The solution is poured into hot oil.
5. II: The mixture is boiled and stirred for sometime and then allowed to cool.
6. VI: The crust that forms on top of the liquid is removed.

b) The scientific principle underlying the preparation of soap is saponification.

c) The substance that could be used to speed up the precipitation of the soap is sodium chloride (common salt).

d) It is most appropriate to introduce the catalyst (the alkali from the ash) in step V (when the solution is poured into hot oil).

e) The chemical substance present in the solution of the cocoa pod ash is potassium hydroxide (KOH).

f) Two uses of impurities in the soap produced:

• Impurities can make the soap harsh on the skin.
• Impurities can reduce the lathering ability of the soap.

g) To confirm that the product is soap, one can perform a lathering test (it should produce lather with water) or test its alkalinity using litmus paper (it should turn blue).

a)
A: Caterpillar
B: Bird
C: Roundworm
D: Tick

b) (i) The organisms that can be classified as pests are A, B, and D.

b) (ii) The organisms that can be classified as parasites are C and D.

c)

• Organism B (Bird) attacks maize (or other cereal crops).
• Organism D (Tick) attacks cattle (or other farm animals).

d)

• A (Caterpillar) causes damage by eating leaves (defoliation) or boring into fruits/stems.
• B (Bird) causes damage by eating seeds/grains from crops.
• C (Roundworm) causes damage by depleting nutrients from the host or causing intestinal blockage.

e) One adaptive feature of organism B (Bird) which enables it to cause the damage stated in (d) is its beak, which is adapted for pecking and eating seeds/grains.

f) Two methods of controlling the organism labeled D (Tick) are:

• Dipping or spraying farm animals with acaricides.
• Practicing rotational grazing to break the tick's life cycle.