Esthetician Practice Chemistry and Product Ingredients Questions and Answers

Question 1

What is the average pH of the skin's natural acid mantle, and why is this important for skin health?

Accepted Answer

4.5 to 5.5 (acidic), which provides a protective barrier against bacteria.

Answer

The skin's acid mantle is a protective film on its surface with a pH between 4.5 and 5.5. This acidic environment inhibits the growth of harmful bacteria and fungi, maintaining the skin's barrier function and overall health.

Question 2

Which of the following best describes an oil-in-water (O/W) emulsion, a common formulation for lotions and moisturizers?

Accepted Answer

A formulation where small droplets of oil are dispersed throughout a water base.

Answer

In an oil-in-water (O/W) emulsion, oil droplets are the internal phase, dispersed within the continuous external phase, which is water. These are the most common types of moisturizers as they feel lighter and less greasy on the skin.

Question 3

A client with sensitive, redness-prone skin is looking for a gentle exfoliation treatment. Which of the following ingredients would be the MOST suitable choice for this client?

Accepted Answer

Papain and Bromelain

Answer

Papain (from papaya) and Bromelain (from pineapple) are proteolytic enzymes. They gently exfoliate by digesting the keratin protein in dead skin cells without the potentially irritating low pH of alpha-hydroxy or beta-hydroxy acids, making them ideal for sensitive skin.

Question 4

An esthetician recommends a product containing hyaluronic acid and glycerin for a client with dehydrated skin. What is the primary function of these ingredients?

Accepted Answer

To attract and bind water to the skin from the air and deeper dermal layers.

Answer

Hyaluronic acid and glycerin are powerful humectants. Their primary function is to attract water molecules from the environment and the dermis and bind them to the epidermis, thereby plumping and hydrating the skin.

Question 5

Which of the following ingredients is a physical sunscreen agent that works by reflecting and scattering UV radiation away from the skin?

Accepted Answer

Zinc Oxide

Answer

Zinc Oxide and Titanium Dioxide are physical (or mineral) sunscreen ingredients. They create a physical barrier on the skin that blocks, reflects, and scatters UV rays. Avobenzone, Oxybenzone, and Octinoxate are chemical sunscreen agents that work by absorbing UV radiation and converting it into heat.

Esthetician Practice Exam Practice Test

Esthetician Practice Exam Practice Test

Esthetician Practice Chemistry and Product Ingredients Questions and Answers