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

7.0 (neutral), which prevents product irritation.

Answer

8.0 to 9.0 (alkaline), which helps to naturally exfoliate dead skin cells.

Answer

2.5 to 3.5 (highly acidic), which is necessary for deep product penetration.

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

A mixture where oil is the external phase and water droplets are dispersed within it.

Answer

A stable blend of two completely mixable liquids, like water and alcohol.

Answer

A product where solid particles are suspended in a liquid, requiring it to be shaken.

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

Glycolic acid

Answer

Salicylic acid

Answer

A manual scrub with large, abrasive particles

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

To provide broad-spectrum protection against UV radiation.

Answer

To dissolve the intercellular cement holding dead skin cells together.

Answer

To create a physical barrier to prevent transepidermal water loss.

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

Avobenzone

Answer

Oxybenzone

Answer

Octinoxate

Question 6

A client concerned with environmental damage, fine lines, and dullness is considering adding a serum to their routine. A product featuring L-ascorbic acid would primarily help this client by:

Accepted Answer

Neutralizing free radicals and supporting collagen synthesis.

Answer

Chemically exfoliating the stratum corneum to reveal brighter skin.

Answer

Increasing the skin's oil production to combat dryness.

Answer

Absorbing excess sebum and minimizing the appearance of pores.