Esthetician Practice Esthetics Chemistry and Ingredients Questions and Answers

Question 1

The skin's natural acid mantle, which protects against bacterial growth and moisture loss, has an approximate pH of:

Accepted Answer

4.5 to 5.5

Answer

The skin's acid mantle is a protective barrier that is naturally slightly acidic, with a pH typically ranging from 4.5 to 5.5. This acidity is crucial for inhibiting harmful bacteria and maintaining the skin's overall health and barrier function.

Question 2

A client with dehydrated skin is looking for a serum to help bind moisture to their epidermis. Which of the following ingredients is classified as a humectant and would be most effective for this purpose?

Accepted Answer

Hyaluronic Acid

Answer

Hyaluronic acid is a powerful humectant, meaning it attracts and binds water molecules to the skin's surface, which is ideal for treating dehydration. Petrolatum, shea butter, and jojoba oil are primarily emollients or occlusives, which work by creating a barrier to prevent water loss rather than attracting water.

Question 3

A client is concerned about environmental damage and wants to incorporate products that protect against free radicals. Which of the following ingredient categories should an esthetician recommend?

Accepted Answer

Antioxidants

Answer

Antioxidants, such as Vitamin C, Vitamin E, and green tea extract, are specifically designed to neutralize free radicals. Free radicals are unstable molecules from UV rays and pollution that can damage skin cells and accelerate aging.

Question 4

In cosmetic chemistry, what is the primary role of a surfactant in a facial cleanser?

Accepted Answer

To enable oil and water to mix, thereby lifting dirt and sebum.

Answer

Surfactants, or surface-active agents, have a unique structure that attracts both oil and water. This property allows them to break down the surface tension between the two, creating an emulsion that lifts away dirt, oil, and makeup so they can be rinsed off the skin.

Question 5

An esthetician is choosing an exfoliant for a client with oily, congested skin and blackheads. Which acid is oil-soluble, allowing it to penetrate into the pore to dissolve sebum and debris?

Accepted Answer

Salicylic Acid

Answer

Salicylic acid is a Beta Hydroxy Acid (BHA) that is oil-soluble. This unique characteristic allows it to penetrate the lipid barrier of the pores to effectively exfoliate from within and clear out sebum and dead skin cells, making it ideal for oily and acne-prone skin. The other acids listed are Alpha Hydroxy Acids (AHAs), which are water-soluble and work primarily on the skin's surface.

Esthetician Practice Exam Practice Test

Esthetician Practice Exam Practice Test

Esthetician Practice Esthetics Chemistry and Ingredients Questions and Answers