Answer: negative sulfonate group.
- A a positive head group
- B negative sulfonate group
- C a neutral head group
- D a single metal atom
Correct answer: B. negative sulfonate group
Explanation: Anionic detergents carry a negatively charged sulfonate or sulfate head, e.g. sodium alkylbenzenesulfonates.
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.