Esthetician Practice Exam Esthetician Practice Chemistry and Product Ingredients 1

Question 1

Which of the following best describes the mechanism of action of alpha hydroxy acids (AHAs) on the skin?

Accepted Answer

They loosen the bonds between corneocytes, promoting exfoliation of dead skin cells

Answer

They neutralize free radicals by donating electrons to unstable molecules

Answer

They stimulate melanin production in the basal layer of the epidermis

Answer

They cross-link collagen fibers to increase skin firmness

Question 2

What is the primary role of emollients in a skincare formulation?

Accepted Answer

To fill gaps between skin cells and smooth the skin's surface

Answer

To kill bacteria on the skin surface through antimicrobial action

Answer

To draw water from the dermis into the epidermis

Answer

To lower the pH of a product to improve active ingredient penetration

Question 3

Which preservative system is most commonly used in natural or 'clean beauty' formulations as an alternative to parabens?

Accepted Answer

Phenoxyethanol

Answer

Methylparaben

Answer

Formaldehyde releasers

Answer

Sodium lauryl sulfate

Question 4

Niacinamide (Vitamin B3) is valued in skincare primarily because it:

Accepted Answer

Inhibits the transfer of melanosomes from melanocytes to keratinocytes

Answer

Acts as a chemical exfoliant by dissolving the skin's lipid barrier

Answer

Increases transepidermal water loss to improve cell turnover

Answer

Functions as a UV filter by absorbing ultraviolet radiation

Question 5

Which of the following ingredient categories functions as a humectant?

Accepted Answer

Glycerin

Answer

Cetyl alcohol

Answer

Dimethicone

Answer

Titanium dioxide

Question 6

A formulator wants to create an oil-in-water (O/W) emulsion. Which of the following emulsifiers would be most appropriate?

Accepted Answer

An emulsifier with a high HLB value (8–18)

Answer

An emulsifier with a low HLB value (3–6)

Answer

A purely hydrophobic wax such as carnauba wax

Answer

A silicone-based occlusive agent