Cosmetology Test Scientific Concepts 2

Question 1

Which type of chemical bond is broken when hair is permanently waved?

Accepted Answer

Disulfide bonds

Answer

Permanent waving breaks disulfide bonds using a reducing agent, then reforms them in a new shape with a neutralizer.

Question 2

What is the pH range considered neutral on the pH scale?

Accepted Answer

7

Answer

A pH of 7 is neutral; values below 7 are acidic and values above 7 are alkaline.

Question 3

Which layer of the hair is responsible for its strength and elasticity?

Accepted Answer

Cortex

Answer

The cortex contains the fibrous proteins and disulfide bonds that give hair its strength and elasticity.

Question 4

What type of reaction occurs when an oxidizing agent is applied to hair during color processing?

Accepted Answer

Oxidation

Answer

Oxidation involves the loss of electrons or addition of oxygen, which activates hair color developers and neutralizers.

Question 5

Sebum is produced by which gland in the skin?

Accepted Answer

Sebaceous gland

Answer

Sebaceous glands produce sebum, the natural oil that lubricates and waterproofs the skin and hair.

Cosmetology Test Practice Test