Which of the following statements about surfactants is NOT true?
A contains a lipophilic molecule
B contains a hydrophilic molecule
C used to remove oil from the hair
D prevents shampoo from lathering
The Correct Answer and Explanation is :
The statement that is NOT true is:
D. prevents shampoo from lathering.
Explanation:
Surfactants, or surface-active agents, are compounds that lower the surface tension between two substances, such as oil and water. They are critical components in many personal care products, including shampoos, due to their ability to facilitate the mixing of water and oil, which is essential for effective cleaning.
A. Contains a lipophilic molecule: This statement is true. Surfactants typically have a dual structure consisting of a hydrophilic (water-attracting) head and a hydrophobic (lipophilic or oil-attracting) tail. The lipophilic part is responsible for interacting with oils and grease, allowing them to be emulsified and washed away with water.
B. Contains a hydrophilic molecule: This statement is also true. As mentioned, surfactants have a hydrophilic head that interacts with water, making it possible for the product to disperse in an aqueous solution and help remove dirt and oil from surfaces like hair and skin.
C. Used to remove oil from the hair: This statement is true as well. Surfactants play a crucial role in shampoo formulations by helping to lift and emulsify oils and dirt from the hair and scalp. When shampoo is massaged into the hair, the surfactants surround the oil particles, allowing them to be rinsed away easily with water.
D. Prevents shampoo from lathering: This statement is false. In fact, surfactants are responsible for the lathering action in shampoos. They reduce the surface tension of water, allowing it to form bubbles and create foam when agitated. This lather is often associated with the cleaning efficacy of shampoos and helps distribute the product throughout the hair.
In summary, surfactants are vital for the cleansing properties of shampoos, enabling them to remove oils effectively while producing a desirable lather.