Answer: micelles.
- A crystals
- B micelles
- C precipitates
- D gases
Correct answer: B. micelles
Explanation: Soap molecules cluster into micelles that trap grease in their hydrophobic centres, allowing it to be washed away.
The hydrophobic hydrocarbon tail of each soap/detergent molecule dissolves into an oily dirt droplet, while the hydrophilic (ionic) head stays in the surrounding water - trapping the grease inside a micelle that rinses away with water.
Concept context
Drugs and how they interact with biological targets, chemicals in food, and cleansing agents (soaps and detergents) - chemistry applied directly to daily life and healthcare.