Answer: a preservative.
- A a sweetener
- B a preservative
- C a detergent
- D a colouring dye
Correct answer: B. a preservative
Explanation: Sodium benzoate is a common preservative that inhibits the growth of moulds and bacteria.
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.