Cleansing

What is the primary purpose of cleansing products in cosmetics?

• To add moisture to the skin

• To remove oils, particulates, and microorganisms from the skin and hair

• To change the pH level of the skin

• To promote skin cell regeneration

What is the primary role of surfactants in cleansing products?

• To increase the pH of the skin

• To act as a moisturizer

• To emulsify and remove oily substances

• To create a protective barrier on the skin

What is the primary factor that allows surfactants to adsorb to surfaces?

• Hydrophilic interactions

• Hydrophobic interactions

• The presence of salts in water

• The pH level of the solution

Which of the following best describes the structure of a surfactant molecule?

• A single hydrophilic group

• A balanced mix of water and oil

• A hydrophobic tail and a hydrophilic head

• A completely hydrophobic structure

What is the main mechanism behind the "rollup" effect in cleansing?

• Oil molecules repel each other and dissolve in water

• Surfactants decrease interfacial tension, making oil droplets detach from surfaces

• Water molecules surround oil droplets and break them down

• Oils mix with surfactants to create foam

Which of the following factors affects foam stability?

• The addition of surfactants

• The presence of salts in the water

• The use of high temperatures

• The absence of any emulsifiers

Why do emulsions require stabilizers?

• To prevent the separation of oil and water phases

• To dissolve surfactants

• To increase the HLB value of the surfactant

• To make the emulsion evaporate faster

The primary purpose of cleansing products is to remove __________, particulates, and microorganisms from the skin and hair.

Surfactants are amphipathic molecules, meaning they contain both a __________ segment and a __________ segment.

Emulsions are stabilized by substances called __________, which help prevent phase separation of oil and water.