Hair Chemistry Quiz

What is the primary protein that makes up hair?

• Collagen

• Elastin

• Keratin

• Myosin

Which type of bond provides hair with its strength and shape?

• Hydrogen bonds

• Ionic bonds

• Disulfide bonds

• Van der Waals forces

What is the function of surfactants in shampoo?

• Strengthening the hair structure

• Removing oil and dirt by forming micelles

• Depositing color molecules

• Breaking disulfide bonds

Which of the following is a common surfactant found in sulfate shampoos?

• Sodium Lauryl Sulfate (SLS)

• Cetrimonium chloride

• Polyvinylpyrrolidone (PVP)

• Ammonium thioglycolate

How do conditioners help smooth the hair cuticle?

• They remove excess protein from the hair shaft.

• They use negatively charged molecules to repel frizz.

• They dissolve the cuticle layer to create a smoother surface.

• They contain cationic surfactants that neutralize the hair’s negative charge

What is the role of silicones in conditioners?

• Coating the hair shaft to reduce frizz and add shine

• Strengthening peptide bonds

• Breaking down keratin for easier styling

• Stripping the hair of natural oils

Which of the following ingredients is commonly found in hair gels to provide hold?

• Polyvinylpyrrolidone (PVP)

• Behentrimonium chloride

• Sodium hydroxide

• Hydrogen peroxide

What is the purpose of hydrogen peroxide (H₂O₂) in hair bleaching?

• Depositing artificial pigments
  

• Breaking down melanin molecules

• Strengthening hair cuticles

• Sealing in moisture

Which of the following is used in perms to break disulfide bonds?

• Cocamidopropyl betaine

• Ammonium thioglycolate

• Behentrimonium chloride

• Dimethicone

How do hair relaxers work?

• They coat the hair with a polymer to maintain straightness.

• They dissolve the keratin structure of the hair.

• They use sodium hydroxide to break and rearrange disulfide bonds.

• They use hydrogen peroxide to oxidize the cuticle.