How does soap work to clean our hands?
Correct answer: C. The soap disintegrates grease on the skin due to its non-polar tail
- A. The slippery nature of the soap causes the germs to slip off
- B. The soap traps germs and dirt and is washed off with them
- C. The soap disintegrates grease on the skin due to its non-polar tail
- D. The soap produces free radicals which destroy the germs on our hands
Explanation
Soap works through its molecular structure, which consists of a hydrophobic (non-polar) tail and a hydrophilic head. The non-polar tails bind to oils and grease on the skin, breaking them down. The hydrophilic heads allow these particles to be rinsed away with water. This is why Option C is correct.Option A is incorrect because slipperiness is not a factor in removing germs.Option B is incorrect as soap does not simply trap dirt and germs; it interacts chemically with them.Option D is incorrect because soap does not produce free radicals.
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About Scientific Reasoning
Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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