The Science of Shampoo and Hair

Why do oil and water not mix?

• Because oil is heavier than water

• Because oil and water have different types of molecules

• Because water is sticky

• Because oil is hot

What is the main job of shampoo?

• To make hair smell nice

• To clean grease and dirt from hair

• To make hair shiny

• To change hair colour

What are surfactants in shampoo?

• Tiny bubbles

• Special molecules that help clean hair

• Colours in the shampoo

• Fragrances in the shampoo

What does the hydrophilic end of a surfactant do?

• It loves oil

• It loves water

• It makes bubbles

• It changes colour

What does the hydrophobic end of a surfactant do?

• It loves water

• It loves oil

• It makes hair shiny

• It changes the smell

What happens when you use shampoo on greasy hair?

• The grease disappears

• The grease is mixed with water

• The grease is lifted and rinsed away

• The grease changes colour

What is emulsification in shampooing?

• Making hair smell nice

• Mixing oil and water to clean hair

• Changing hair colour

• Making hair shiny

How do surfactants help in cleaning hair?

• They make hair smell nice

• They trap dirt and grease so it can be washed away

• They change the colour of hair

• They make hair grow faster

Why is it important to rinse shampoo out of your hair?

• To make hair smell nice

• To remove trapped dirt and grease

• To make hair shiny

• To change hair colour

Which type of surfactant is best for hair and scalp health?

• The cheapest one

• The one that makes the most bubbles

• The one that is gentle and effective

• The one with the strongest smell