Esthetician Practice Exam Esthetician Practice Cosmetic Chemistry and Ingredients 1

Question 1

Which pH range is considered optimal for most facial cleansers to maintain the skin's acid mantle?

Accepted Answer

pH 4.5–5.5

Answer

The skin's natural acid mantle sits between pH 4.5 and 5.5. Cleansers formulated in this range help preserve the protective barrier and prevent disruption of the microbiome.

Question 2

What is the primary purpose of a chelating agent such as EDTA in a cosmetic formulation?

Accepted Answer

To bind and neutralize metal ions that cause rancidity

Answer

Chelating agents like EDTA bind to trace metal ions (such as calcium and iron) in the formula that can catalyze oxidation and break down preservatives, thereby extending shelf life and stability.

Question 3

Which of the following best describes the function of a surfactant in a facial cleanser?

Accepted Answer

It lowers surface tension to allow oil and water to mix and be rinsed away

Answer

Surfactants have hydrophilic (water-loving) and lipophilic (oil-loving) ends that allow them to surround and lift sebum and debris, enabling them to be rinsed away with water.

Question 4

Retinol belongs to which broader class of cosmetic ingredients?

Accepted Answer

Retinoids (Vitamin A derivatives)

Answer

Retinol is a form of Vitamin A and is classified as a retinoid. It promotes cell turnover and stimulates collagen synthesis, making it a key anti-aging ingredient.

Question 5

What is the role of niacinamide (Vitamin B3) when used in a skincare formulation?

Accepted Answer

It helps reduce hyperpigmentation and strengthens the skin barrier

Answer

Niacinamide inhibits the transfer of melanosomes to keratinocytes, reducing hyperpigmentation. It also increases ceramide production, reinforcing the skin barrier and reducing trans-epidermal water loss (TEWL).

Esthetician Practice Exam Practice Test

Esthetician Practice Exam Practice Test

Esthetician Practice Exam Esthetician Practice Cosmetic Chemistry and Ingredients 1