Making Homemade Soap

13 Grade 7 Agriculture questions on Making Homemade Soap, with worked marking schemes. 13 questions are available on this topic in full.

1. Question 1

   1 mark

   The chemical reaction between a fat or oil and an alkali to form soap is called:

   A. Germination

   B. Fermentation

   C. Evaporation

   D. Saponification

   (1 mark)

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2. Question 2

   4 marks

   Making soap at home involves working with caustic materials. State four safety precautions a learner should observe during the activity.

   (4 marks)

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3. Question 3

   6 marks

   During a Grade 7 practical lesson, learners make homemade soap to use for washing in the school and to sell to raise funds.

   (a) State TWO safety precautions the learners should observe when handling the chemicals used in soap making. (2 marks)

   (b) Give TWO uses of the homemade soap in the home. (2 marks)

   (c) Suggest TWO ways the learners can make their soap attractive to customers. (2 marks)

   (6 marks)

   Marking scheme

   (a) (any TWO, 1 mark each): - Wear protective gear such as gloves and an apron to protect the skin and eyes from caustic chemicals (e.g. caustic soda/lye). - Work in a well-ventilated area and avoid inhaling fumes. - Avoid splashing chemicals on the skin or eyes and keep chemicals away from food and children. - When mixing, add the caustic soda slowly into the water (never water into the dry chemical) to avoid a violent reaction. (b) (any TWO, 1 mark each): - Washing clothes/laundry. - Washing utensils and cleaning surfaces. - Bathing/washing the body and hands for personal hygiene. (c) (any TWO, 1 mark each): - Add colour/dye to make the soap look appealing. - Add a pleasant scent/perfume or natural fragrance. - Mould the soap into neat, uniform shapes and package/label it attractively.

4. Question 4

   5 marks

   Outline the steps a learner would follow to make a simple bar of homemade soap.

   (5 marks)

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5. Question 5

   1 mark

   Because lye (caustic soda) is corrosive, a learner making soap should ALWAYS:

   A. Taste it to confirm the strength

   B. Handle it with bare wet hands

   C. Store it in an open cup

   D. Wear gloves and eye protection when handling it

   (1 mark)

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6. Question 6

   1 mark

   A learner adds a little fragrance and colour to her homemade soap. The MAIN reason for adding these is to:

   A. Harden the soap faster

   B. Speed up saponification

   C. Make the soap clean better

   D. Improve the scent and appearance of the soap

   (1 mark)

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7. Question 7

   6 marks

   Explain two economic and one environmental benefit of making soap at home.

   (6 marks)

   Marking scheme

   Economic (2 marks each, any two): saves money/reduces household expenditure on buying soap; can be sold to earn income/create employment; uses locally available and cheap raw materials such as used oils/fats. Environmental (2 marks, one): recycles used cooking oil/fats that would otherwise be waste, reducing pollution; allows control of ingredients avoiding harmful additives. Max 6 (4 for economic + 2 for environmental).

8. Question 8

   1 mark

   After pouring the soap mixture into moulds, why is it left to cure for a period of time before use?

   A. To allow it to harden and the reaction to complete

   B. To make it change colour

   C. To dissolve it completely

   D. To increase its water content

   (1 mark)

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9. Question 9

   3 marks

   A group of learners want to make homemade soap as an income-generating project.

   (a) Name the two main ingredients they will need.

   (b) Name the chemical process that takes place when these are combined.

   (3 marks)

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10. Question 10

    6 marks

    A Grade 7 class is carrying out a project to make homemade soap from locally available materials to use for washing in the school. The teacher emphasises safety because one of the ingredients is caustic.

    (a) Name the TWO main reacting ingredients required to make the soap. (2 marks)

    (b) Explain TWO safety precautions the learners should observe when handling caustic soda (sodium hydroxide) during the activity. (4 marks)

    (6 marks)

    Marking scheme

    (a) (1 mark each): a fat or oil (e.g. cooking oil, animal fat/tallow); an alkali - caustic soda (sodium hydroxide) [or caustic potash for soft soap]. (b) Any TWO well-explained (2 marks each = 4 marks): (1) Wear protective clothing such as gloves, an apron and eye goggles, because caustic soda is corrosive and can burn the skin and eyes on contact. (2) Add the caustic soda slowly to the water (never water to the soda) and stir carefully in a well-ventilated place, because dissolving the soda gives off a lot of heat and fumes that can cause violent splashing, burns or breathing problems. (Accept: keep it away from children and food; do not touch or taste it; wash off immediately with plenty of water if it touches the skin.)

11. Question 11

    1 mark

    When mixing lye with water during soap making, the correct and safer practice is to:

    A. Add the lye slowly to the water

    B. Add the water quickly to the lye

    C. Mix them in a sealed bottle

    D. Heat the lye until it boils

    (1 mark)

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12. Question 12

    1 mark

    Which two main ingredients react together in the process of making homemade soap?

    A. Sugar and salt

    B. A fat/oil and an alkali (lye)

    C. Vinegar and water

    D. Flour and yeast

    (1 mark)

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13. Question 13

    1 mark

    Which of the following is an advantage of making soap at home for a family in a rural area?

    A. It can lower household costs and use locally available materials

    B. It cannot be used for washing clothes

    C. It makes soap that never cleans

    D. It removes the need for water

    (1 mark)

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